codex_review.diff

diff --git a/dev/build/ProjectInstructions/PROJECT_INSTRUCTIONS.md b/dev/build/ProjectInstructions/PROJECT_INSTRUCTIONS.md
index 524ef94fb..1e65998c6 100644
--- a/dev/build/ProjectInstructions/PROJECT_INSTRUCTIONS.md
+++ b/dev/build/ProjectInstructions/PROJECT_INSTRUCTIONS.md
@@ -117,7 +117,7 @@ Rules:

 ## Current Version/Date

-- Project Instructions Version: 2026.06.28.019
+- Project Instructions Version: 2026.06.28.020
 - Date: 2026-06-28
 - Owner: OWNER

diff --git a/dev/build/ProjectInstructions/PROJECT_INSTRUCTIONS_VERSION.md b/dev/build/ProjectInstructions/PROJECT_INSTRUCTIONS_VERSION.md
index 8f53d469f..f809be6a3 100644
--- a/dev/build/ProjectInstructions/PROJECT_INSTRUCTIONS_VERSION.md
+++ b/dev/build/ProjectInstructions/PROJECT_INSTRUCTIONS_VERSION.md
@@ -1,6 +1,6 @@
 # Project Instructions Version

-Current Project Instructions Version: 2026.06.28.019
+Current Project Instructions Version: 2026.06.28.020

 Last Updated: 2026-06-28

@@ -27,6 +27,7 @@ Last Updated: 2026-06-28
 - Removed the local demo `.gfsp` artifact and recorded a file-by-file `src/` destination audit for future scoped migrations.
 - Moved PR017-audited browser/www-owned legacy `src/` files into `www/src/` while preserving public `/src/...` browser route compatibility under the `www` web root.
 - Moved PR019a-audited active browser/runtime shared contracts and tool schemas into `www/src/shared/` while preserving public `/src/shared/...` browser route compatibility.
+- Removed obsolete root `src/` legacy placeholders, stale schema README files, and archived-only debug helpers while preserving active contracts and validation schemas.
 - Codex must read this version file and the latest repository copy of `PROJECT_INSTRUCTIONS.md` before performing work.
 - Codex must discard previously remembered Project Instructions and treat the repository copy as authoritative.
 - Codex must validate canonical report and ZIP paths, branching model, and legacy path avoidance before work proceeds.
diff --git a/dev/build/ProjectInstructions/PROJECT_STATE.md b/dev/build/ProjectInstructions/PROJECT_STATE.md
index dd9f058ab..8bd72875d 100644
--- a/dev/build/ProjectInstructions/PROJECT_STATE.md
+++ b/dev/build/ProjectInstructions/PROJECT_STATE.md
@@ -1,7 +1,7 @@
 # Project State

 ```yaml
-project_state_version: "2026.06.28.019"
+project_state_version: "2026.06.28.020"
 last_updated: "2026-06-28"
 current_main_commit: "40de767476d70cadfd1292c916844c2f31b6f185"
 repository_status:
@@ -10,9 +10,9 @@ repository_status:
   runtime_database: "Postgres"
   creator_metadata: "API to Postgres"
   creator_assets: "API to R2"
-project_instructions_version: "2026.06.28.019"
-repository_structure_version: "2026.06.28.019"
-canonical_layout_version: "2026.06.28.019"
+project_instructions_version: "2026.06.28.020"
+repository_structure_version: "2026.06.28.020"
+canonical_layout_version: "2026.06.28.020"
 active_teams:
   - "Owner"
   - "Alfa"
@@ -20,8 +20,8 @@ active_teams:
   - "Charlie"
   - "Delta"
   - "Golf"
-latest_owner_pr: "PR_26180_OWNER_019b-move-browser-shared-schemas-to-www"
-latest_structure_pr: "PR_26180_OWNER_019b-move-browser-shared-schemas-to-www"
+latest_owner_pr: "PR_26180_OWNER_020-src-legacy-teardown"
+latest_structure_pr: "PR_26180_OWNER_020-src-legacy-teardown"
 valid_top_level_folders:
   - "api/"
   - "deploy/"
@@ -41,7 +41,6 @@ valid_dev_folders:
   - "dev/workspace/"
 known_technical_debt:
   - "Remaining API/server-owned contracts, validation-only schemas, and project data store modules remain under src/shared/ until scoped follow-up PRs move them to api/ or dev/."
-  - "Developer/source reference files remain under src/ until PR_26180_OWNER_020 moves them to dev/."
-  - "src/dev-runtime/admin/.gitkeep remains as a placeholder until PR_26180_OWNER_021 retires the empty root src folder."
+  - "Remaining actively validated contracts, validation schemas, and project data store modules remain under src/shared/ until scoped follow-up PRs move them to api/ or dev/."
   - "repository_directory_standard.md and codex_project_instructions_startup.md are superseded pointers retained for compatibility."
 ```
diff --git a/dev/build/ProjectInstructions/backlog/BACKLOG_MASTER.md b/dev/build/ProjectInstructions/backlog/BACKLOG_MASTER.md
index 2f73709cb..cfbad05b6 100644
--- a/dev/build/ProjectInstructions/backlog/BACKLOG_MASTER.md
+++ b/dev/build/ProjectInstructions/backlog/BACKLOG_MASTER.md
@@ -40,7 +40,7 @@ The backlog is the authoritative source for determining the next logical PRs.
 - Product Area: Repository Architecture Simplification
 - Status: Active
 - Percent Complete: 99%
-- Active PR: PR_26180_OWNER_019b-move-browser-shared-schemas-to-www
+- Active PR: PR_26180_OWNER_020-src-legacy-teardown
 - Next Milestone: Move remaining API/server-owned source to api/
 - Source / Reference: `dev/build/ProjectInstructions/repository/repository_layout_architecture_plan.md`; `dev/build/ProjectInstructions/repository/www_migration_map.md`

diff --git a/dev/build/ProjectInstructions/repository/canonical_repository_structure.md b/dev/build/ProjectInstructions/repository/canonical_repository_structure.md
index 41be18217..d60ba6140 100644
--- a/dev/build/ProjectInstructions/repository/canonical_repository_structure.md
+++ b/dev/build/ProjectInstructions/repository/canonical_repository_structure.md
@@ -90,7 +90,6 @@ Legacy transition buckets:
 - src/shared/contracts/
 - src/shared/schemas/
 - src/shared/projectDataStore/
-- src/dev-runtime/admin/.gitkeep

 The `www/src/` legacy transition buckets preserve public `/src/...` browser import compatibility during source retirement. Remaining root `src/` buckets may remain only until explicit stacked migration PRs move them to `api/` or `dev/`.

diff --git a/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_branch-validation.md b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_branch-validation.md
new file mode 100644
index 000000000..759f6b6d0
--- /dev/null
+++ b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_branch-validation.md
@@ -0,0 +1,13 @@
+# PR_26180_OWNER_020 Branch Validation
+
+| Check | Status | Notes |
+|-------|--------|-------|
+| Current branch | PASS | `PR_26180_OWNER_020-src-legacy-teardown` |
+| Expected base | PASS | Stacked on `PR_26180_OWNER_019b-move-browser-shared-schemas-to-www` workstream branch. |
+| Worktree scope | PASS | Changes limited to obsolete root `src/` deletions, Project Instructions/backlog status updates, guard baseline alignment, and PR reports. |
+| Runtime/API/UI/database changes | PASS | No active runtime, API, UI, or database implementation files changed. |
+| Protected dev workspace paths | PASS | No protected `dev/workspace/generated`, `dev/workspace/zips`, or `dev/workspace/tmp` files moved or deleted. |
+
+## Branch Decision
+
+PASS. Branch is valid for the stacked Owner Repository Architecture Simplification workstream.
diff --git a/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_manual-validation-notes.md b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_manual-validation-notes.md
new file mode 100644
index 000000000..b4f1af5a7
--- /dev/null
+++ b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_manual-validation-notes.md
@@ -0,0 +1,19 @@
+# PR_26180_OWNER_020 Manual Validation Notes
+
+## Manual Review
+
+- Confirmed current branch is `PR_26180_OWNER_020-src-legacy-teardown`.
+- Confirmed deleted files are limited to obsolete root `src/` placeholders, README notes, and debug helpers with no active references.
+- Confirmed remaining root `src/shared/contracts/**`, `src/shared/projectDataStore/**`, and active schema files are still needed by current validation/test references and were not removed.
+- Confirmed archive-only v1-v2 references to deleted debug helpers remain historical and are not active runtime blockers.
+- Confirmed the shared extraction guard baseline change removes only the deleted `src/shared/debug/network.js` entry.
+
+## Manual Runtime Notes
+
+No runtime/UI/API/database behavior was changed. Playwright was not required because this PR removes unreferenced legacy source files and documentation placeholders only.
+
+## ZIP Notes
+
+The repo-structured ZIP for this PR is generated under:
+
+`dev/workspace/zips/PR_26180_OWNER_020-src-legacy-teardown_delta.zip`
diff --git a/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_report.md b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_report.md
new file mode 100644
index 000000000..cf243ad3b
--- /dev/null
+++ b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_report.md
@@ -0,0 +1,56 @@
+# PR_26180_OWNER_020-src-legacy-teardown Report
+
+## Executive Summary
+
+PR_26180_OWNER_020 continues the root `src/` retirement work by removing legacy files that no longer have active runtime, API, dev script, validation, or test references. The PR preserves active root `src/shared/contracts/**`, `src/shared/projectDataStore/**`, and active schema files because they are still used by current dev validation/tests and require separate follow-up ownership moves.
+
+No browser, API, database, or product behavior changes are introduced.
+
+## Source Of Truth
+
+- Base branch: `PR_26180_OWNER_019b-move-browser-shared-schemas-to-www`
+- Workstream: Repository Architecture Simplification
+- Audit source: PR017 src destination audit and PR019a contracts/schemas obsolescence audit
+- Project Instructions version updated to `2026.06.28.020`
+
+## Deleted Legacy Files
+
+| File | Decision | Reason |
+|------|----------|--------|
+| `src/dev-runtime/admin/.gitkeep` | Deleted | Obsolete placeholder. Admin compatibility runtime now lives under `www/src/dev-runtime/admin/`. |
+| `src/engine/README.md` | Deleted | Legacy empty-engine-era note, not an active architecture source. |
+| `src/shared/debug/config.js` | Deleted | Old debug helper referenced only by archived v1-v2 material. No active runtime/test/script references. |
+| `src/shared/debug/network.js` | Deleted | Old debug helper referenced only by archived v1-v2 material. No active runtime/test/script references. |
+| `src/shared/debug/noopDevConsoleIntegration.js` | Deleted | Old debug helper referenced only by archived v1-v2 material. No active runtime/test/script references. |
+| `src/shared/schemas/README.md` | Deleted | Legacy schema README superseded by active Project Instructions/governance. |
+| `src/shared/schemas/tools/README.md` | Deleted | Legacy tool schema README superseded by active Project Instructions/governance. |
+
+## Preserved Root src Files
+
+| Path | Decision | Reason |
+|------|----------|--------|
+| `src/shared/contracts/**` | Preserved | Still actively imported by `dev/tests/shared/**` contract validation. |
+| `src/shared/projectDataStore/**` | Preserved | Still actively imported by current project data store validation tests. |
+| `src/shared/schemas/game.manifest.schema.json` | Preserved | Still actively referenced by current validation/tests. |
+| `src/shared/schemas/samples/sample.tool-payload.schema.json` | Preserved | Still actively referenced by current validation/tests. |
+
+## Legacy Pattern Audit
+
+| Pattern | Result |
+|---------|--------|
+| `src/shared/debug/*` active references | PASS: no active references outside archive/report/workspace folders. |
+| `src/engine/README` active references | PASS: no active references outside archive/report/workspace folders. |
+| `src/shared/schemas/README` active references | PASS: no active references outside archive/report/workspace folders. |
+| `src/dev-runtime/admin/.gitkeep` active references | PASS: no active references outside archive/report/workspace folders. |
+| `www/src/tools/**` | Not present in this PR scope. |
+| Protected dev workspace paths | PASS: no protected `dev/workspace/generated`, `zips`, or `tmp` files moved. |
+
+Archive-only v1-v2 references to the removed debug helpers remain under `dev/archive/v1-v2/**`. They are historical reference material, not active runtime or validation dependencies.
+
+## Shared Extraction Guard
+
+`dev/tools/toolbox-dev/checkSharedExtractionGuard.baseline.json` was updated by removing the single baseline entry for deleted file `src/shared/debug/network.js`. No broad baseline regeneration was committed.
+
+## Owner Recommendation
+
+Proceed with this teardown PR. Remaining root `src/` files require follow-up PRs because active validation currently depends on them.
diff --git a/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_requirement-checklist.md b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_requirement-checklist.md
new file mode 100644
index 000000000..abd58749e
--- /dev/null
+++ b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_requirement-checklist.md
@@ -0,0 +1,19 @@
+# PR_26180_OWNER_020 Requirement Checklist
+
+| Requirement | Status | Evidence |
+|-------------|--------|----------|
+| Base from `PR_26180_OWNER_019b-move-browser-shared-schemas-to-www` | PASS | Branch `PR_26180_OWNER_020-src-legacy-teardown` was created from the PR019b stack. |
+| Do not copy files again | PASS | PR deletes obsolete legacy files only; no duplicate copies were added. |
+| Delete/archive obsolete root `src/` files only after replacement or proof of legacy status | PASS | Seven files removed after active-reference scan found no active runtime/script/test dependencies. |
+| Preserve runtime behavior | PASS | Removed files had no active references outside archive/report/workspace paths. |
+| Hard stop if active `www/api/dev` runtime or validation imports removed files | PASS | Active-reference scan found no active imports for removed files. |
+| Preserve active root `src/shared/contracts/**` and schemas still needed by validation | PASS | Active contract/schema/project data store files remain in root `src/` for follow-up PRs. |
+| Remove `src/dev-runtime/admin/.gitkeep` if obsolete | PASS | Obsolete placeholder removed. |
+| Audit legacy debug/schema/readme patterns | PASS | Active-reference scan completed; archive-only historical references documented. |
+| Do not move protected developer workspace files | PASS | No `dev/workspace/generated`, `dev/workspace/zips`, or `dev/workspace/tmp` files moved. |
+| Required reports under `dev/reports/` | PASS | PR-specific report, checklist, validation report, manual notes, branch validation, diff, and changed-file report created. |
+| Required ZIP under `dev/workspace/zips/` | PASS | Repo-structured ZIP generated for the PR outcome. |
+
+## Remaining Follow-Up
+
+Root `src/shared/contracts/**`, `src/shared/projectDataStore/**`, and active schema files remain because they are still required by current validation/test lanes.
diff --git a/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_validation-report.md b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_validation-report.md
new file mode 100644
index 000000000..fa866c961
--- /dev/null
+++ b/dev/reports/PR_26180_OWNER_020-src-legacy-teardown_validation-report.md
@@ -0,0 +1,33 @@
+# PR_26180_OWNER_020 Validation Report
+
+## Validation Commands
+
+| Command | Status | Notes |
+|---------|--------|-------|
+| `git diff --check` | PASS | No whitespace errors. |
+| `npm run validate:canonical-structure` | PASS | Canonical repository structure guardrail passed with 0 blocking violations. |
+| `node ./dev/scripts/run-node-test-files.mjs dev/tests/dev-runtime/AdminNotesBoundary.test.mjs dev/tests/dev-runtime/StaticWebRootCompatibility.test.mjs dev/tests/tools/ToolManifestBoundary.test.mjs` | PASS | 3/3 targeted node test files passed. |
+| `node dev/tools/toolbox-dev/checkSharedExtractionGuard.mjs` | PASS | Baseline aligned after removing the deleted `src/shared/debug/network.js` entry. |
+| Active legacy reference scan | PASS | No active references to deleted paths found outside archive/report/workspace folders. |
+
+## Active Legacy Reference Scan
+
+Command:
+
+```powershell
+rg -n "src/shared/debug/(config|network|noopDevConsoleIntegration)|src/engine/README|src/shared/schemas/README|src/shared/schemas/tools/README|src/dev-runtime/admin/.gitkeep" www api dev/scripts dev/tests dev/tools package.json .github --glob '!dev/archive/**' --glob '!dev/reports/**' --glob '!dev/workspace/**'
+```
+
+Result: no matches.
+
+## Archive References
+
+Historical references remain under `dev/archive/v1-v2/**`. These are intentionally excluded from active validation blockers because `dev/archive/` is historical reference material only.
+
+## Product Impact
+
+- Runtime behavior changed: No
+- UI changed: No
+- API changed: No
+- Database changed: No
+- Product feature changed: No
diff --git a/dev/tools/toolbox-dev/checkSharedExtractionGuard.baseline.json b/dev/tools/toolbox-dev/checkSharedExtractionGuard.baseline.json
index c4a7df71b..3572073e6 100644
--- a/dev/tools/toolbox-dev/checkSharedExtractionGuard.baseline.json
+++ b/dev/tools/toolbox-dev/checkSharedExtractionGuard.baseline.json
@@ -3216,11 +3216,6 @@
       "type": "inline-helper-clone",
       "match": "rule:number-is-finite-usage"
     },
-    {
-      "file": "src/shared/debug/network.js",
-      "type": "inline-helper-clone",
-      "match": "rule:number-is-finite-usage"
-    },
     {
       "file": "www/src/shared/game/highScores.js",
       "type": "inline-helper-clone",
diff --git a/src/dev-runtime/admin/.gitkeep b/src/dev-runtime/admin/.gitkeep
deleted file mode 100644
index d0bef0afc..000000000
--- a/src/dev-runtime/admin/.gitkeep
+++ /dev/null
@@ -1 +0,0 @@
-# dev-runtime admin placeholder
diff --git a/src/engine/README.md b/src/engine/README.md
deleted file mode 100644
index 19c1a3f23..000000000
--- a/src/engine/README.md
+++ /dev/null
@@ -1,27 +0,0 @@
-# Engine
-
-Shared framework used by deprecated `archive/v1-v2/samples/` and deprecated `archive/v1-v2/games/`. All modules are ES modules and browser-ready; no build step is required.
-
-## Import Policy
-- Bootstrap via `src/engine/core/index.js` (or `src/engine/core/Engine.js` for legacy direct imports).
-- For subsystems, prefer the public barrel `src/engine/<subsystem>/index.js` when it exists.
-
-## Key Areas
-- `core/` timing, orchestration, metrics
-- `scene/` scene lifecycle and transitions
-- `rendering/` canvas renderers and helpers
-- `input/` keyboard, mouse, gamepad, action mapping
-- `audio/` audio services and backends
-- `physics/` reusable physics primitives and helpers
-- `systems/` reusable runtime system helpers
-- `events/` event routing primitives
-- `camera/` camera and world-to-screen integration
-- `ui/` shared hub and overlay components
-- `world/`, `ecs/`, `collision/`, `utils/` shared math and world helpers
-- `persistence/` serialization and storage
-- `fx/` effects such as `ParticleSystem`
-- platform and pipelines: `runtime/`, `automation/`, `release/`, `security/`, `pipeline/`, `editor/`
-
-## Validation
-- Automated: `npm test` (81/81 passing as of 03/25/2026)
-- In-repo usage: numbered samples and shipped games (Asteroids, Space Duel, Space Invaders, Pacman Lite/Full AI, AI Target Dummy)
diff --git a/src/shared/debug/config.js b/src/shared/debug/config.js
deleted file mode 100644
index 1b9580f7a..000000000
--- a/src/shared/debug/config.js
+++ /dev/null
@@ -1,96 +0,0 @@
-import LocalStorageService from '../../engine/persistence/LocalStorageService.js';
-import { safeTrim, toLowerSafe } from '../string/strings.js';
-const BUILD_DEBUG_MODE = 'prod';
-const BUILD_DEBUG_ENABLED = false;
-
-export function parseBooleanFlag(value, fallback) {
-  const normalized = toLowerSafe(value);
-  if (!normalized) {
-    return fallback;
-  }
-  if (normalized === '1' || normalized === 'true' || normalized === 'on' || normalized === 'yes') {
-    return true;
-  }
-  if (normalized === '0' || normalized === 'false' || normalized === 'off' || normalized === 'no') {
-    return false;
-  }
-  return fallback;
-}
-
-export function normalizeDebugMode(value, fallback = 'prod') {
-  const normalized = toLowerSafe(value);
-  if (normalized === 'dev' || normalized === 'qa' || normalized === 'prod') {
-    return normalized;
-  }
-  return fallback;
-}
-
-export function readStoredBoolean(key) {
-  if (!key) {
-    return null;
-  }
-
-  const value = new LocalStorageService().getItem(key, null);
-  if (value === '1') {
-    return true;
-  }
-  if (value === '0') {
-    return false;
-  }
-
-  return null;
-}
-
-export function writeStoredBoolean(key, value) {
-  if (!key) {
-    return;
-  }
-
-  new LocalStorageService().setItem(key, value ? '1' : '0');
-}
-
-export function isLocalDebugEnvironment(documentRef) {
-  const protocol = safeTrim(documentRef?.location?.protocol) || safeTrim(globalThis?.location?.protocol);
-  const hostname = safeTrim(documentRef?.location?.hostname) || safeTrim(globalThis?.location?.hostname);
-
-  if (protocol === 'file:') {
-    return true;
-  }
-
-  return hostname === 'localhost' || hostname === '127.0.0.1' || hostname === '::1';
-}
-
-export function resolveDebugConfig(documentRef, options = {}) {
-  const debugStateStorageKey = safeTrim(options?.storageKey);
-  const search = safeTrim(documentRef?.location?.search) || safeTrim(globalThis?.location?.search);
-  const searchParams = new URLSearchParams(search);
-  const queryMode = searchParams.get('debugMode');
-  const queryEnabled = searchParams.get('debug');
-  const queryRemember = searchParams.get('rememberDebug');
-  const queryDemo = searchParams.get('debugDemo');
-  const localDebugEnvironment = isLocalDebugEnvironment(documentRef);
-  const rememberDebugState = parseBooleanFlag(queryRemember, false);
-  const demoMode = parseBooleanFlag(queryDemo, false);
-  const defaultMode = localDebugEnvironment
-    ? 'dev'
-    : normalizeDebugMode(BUILD_DEBUG_MODE, 'prod');
-  const debugMode = normalizeDebugMode(queryMode, demoMode ? 'qa' : defaultMode);
-  const fallbackEnabled = (BUILD_DEBUG_ENABLED === true || localDebugEnvironment) && debugMode !== 'prod';
-  const storedDebugEnabled = debugStateStorageKey && rememberDebugState && queryEnabled === null
-    ? readStoredBoolean(debugStateStorageKey)
-    : null;
-  const debugEnabled = demoMode
-    ? true
-    : parseBooleanFlag(queryEnabled, storedDebugEnabled ?? fallbackEnabled);
-
-  if (debugStateStorageKey && rememberDebugState) {
-    writeStoredBoolean(debugStateStorageKey, debugEnabled);
-  }
-
-  return {
-    debugMode,
-    debugEnabled,
-    rememberDebugState,
-    demoMode
-  };
-}
diff --git a/src/shared/debug/network.js b/src/shared/debug/network.js
deleted file mode 100644
index 80760171b..000000000
--- a/src/shared/debug/network.js
+++ /dev/null
@@ -1,67 +0,0 @@
-import { asNumber } from "../math/numberNormalization.js";
-import { asArray } from "../array/arrays.js";
-import { asObject } from "../object/objects.js";
-import { safeTrim } from "../string/strings.js";
-
-function toSafeKey(value) {
-  return safeTrim(value);
-}
-
-export { asNumber, asArray, asObject };
-export const sanitizeText = safeTrim;
-
-export function toNetworkSnapshot(snapshot, sampleKey) {
-  const key = toSafeKey(sampleKey);
-  if (!key) {
-    return {};
-  }
-  return asObject(snapshot?.assets?.[key]);
-}
-
-export function getCommandSnapshot(context, sampleKey) {
-  const key = toSafeKey(sampleKey);
-  if (!key) {
-    return {};
-  }
-  return asObject(context?.assets?.[key]);
-}
-
-export function commandLinesForTrace(context, args = [], options = {}) {
-  const normalizedOptions = asObject(options);
-  const sanitize = typeof normalizedOptions?.sanitizeText === "function"
-    ? normalizedOptions.sanitizeText
-    : sanitizeText;
-  const formatNumber = typeof normalizedOptions?.formatNumber === "function"
-    ? normalizedOptions.formatNumber
-    : asNumber;
-
-  const snapshot = getCommandSnapshot(context, normalizedOptions?.sampleKey);
-  const trace = asObject(snapshot.trace);
-  const events = asArray(trace.events);
-
-  const requestedCount = Number.parseInt(args?.[0], 10);
-  const count = Number.isFinite(requestedCount)
-    ? Math.min(20, Math.max(1, requestedCount))
-    : 8;
-
-  if (events.length === 0) {
-    return ["No network trace events recorded."];
-  }
-
-  const phaseField = toSafeKey(normalizedOptions?.phaseField) || "phase";
-  return events
-    .slice(-count)
-    .reverse()
-    .map((event) => {
-      const source = asObject(event);
-      const details = asObject(source.details);
-      const detailsText = Object.keys(details)
-        .slice(0, 2)
-        .map((key) => `${key}=${String(details[key])}`)
-        .join(" ");
-      const eventType = sanitize(source.type) || "EVENT";
-      const phase = sanitize(source[phaseField]) || "unknown";
-      const prefix = `${formatNumber(source.timestampMs, 0)}ms ${eventType} phase=${phase}`;
-      return detailsText ? `${prefix} ${detailsText}` : prefix;
-    });
-}
diff --git a/src/shared/debug/noopDevConsoleIntegration.js b/src/shared/debug/noopDevConsoleIntegration.js
deleted file mode 100644
index 086fffeb8..000000000
--- a/src/shared/debug/noopDevConsoleIntegration.js
+++ /dev/null
@@ -1,26 +0,0 @@
-export function createNoopDevConsoleIntegration() {
-  const runtime = Object.freeze({
-    showOverlay() {},
-    hideOverlay() {},
-    showConsole() {},
-    hideConsole() {},
-  });
-
-  return Object.freeze({
-    update() {},
-    render() {},
-    dispose() {},
-    executeCommand() {
-      return { status: 'disabled', output: [] };
-    },
-    getRuntime() {
-      return runtime;
-    },
-    getState() {
-      return {
-        consoleVisible: false,
-        overlayVisible: false,
-      };
-    },
-  });
-}
diff --git a/src/shared/schemas/README.md b/src/shared/schemas/README.md
deleted file mode 100644
index bd1afe5c1..000000000
--- a/src/shared/schemas/README.md
+++ /dev/null
@@ -1,16 +0,0 @@
-# Tool Schemas
-
-JSON schema contracts for tools, samples, and palettes belong here. Workspace Manager V2 uses game manifest validation plus manifest/toolState contract checks instead of a separate Workspace validation contract.
-
-Root-level schema files should not be added.
-
-## Layout
-
-```text
-src/shared/schemas/
-  palette.schema.json
-  samples
-    sample.tool-payload.schema.json
-  toolbox/
-    <tool>.schema.json
-```
diff --git a/src/shared/schemas/tools/README.md b/src/shared/schemas/tools/README.md
deleted file mode 100644
index 3aa74a489..000000000
--- a/src/shared/schemas/tools/README.md
+++ /dev/null
@@ -1,15 +0,0 @@
-# Tool-Specific Schemas
-
-Each active tool gets one payload schema here.
-
-Examples:
-
-```text
-object-vector-studio-v2.schema.json
-svg-asset-studio.schema.json
-sprite-editor.schema.json
-```
-
-Deprecated historical schemas may remain in this directory for reference, but active workspace manifests should not select them for new tool payload ownership.
-
-Samples should validate against the same schema used by the tool manifest.