Move legal implementation notes under docs_build

Author: ToolboxAid

docs_build/dev/reports/PR_26175_OWNER_055-legal-governance-leftover-retention.md

@@ -8,27 +8,30 @@ The previous `MAIN_VERIFY` identified three untracked leftover paths:
 
 | Path | Classification | Retention decision |
 | --- | --- | --- |
-| `IMPLEMENTATION.md` | Legal package implementation/source notes | Retained in this follow-up PR. |
+| `docs_build/legal/IMPLEMENTATION.md` | Legal package implementation/source notes | Retained in this follow-up PR. |
 | `docs_build/legal/LEGAL_CHANGELOG.md` | Legal foundation package governance notes | Retained in this follow-up PR. |
 | `docs_build/dev/reports/PR_26175_OWNER_current-open-pr-status.md` | Generated governance status report | Retained as a snapshot report in this follow-up PR. |
 
 ## Implementation
-- Added the retained package implementation instructions at `IMPLEMENTATION.md`.
+- Added the retained package implementation instructions at `docs_build/legal/IMPLEMENTATION.md`.
 - Added the retained legal changelog at `docs_build/legal/LEGAL_CHANGELOG.md`.
 - Updated and retained `docs_build/dev/reports/PR_26175_OWNER_current-open-pr-status.md` as a current governance snapshot taken after OWNER_054 was merged and before OWNER_055 was opened.
 - Added OWNER_055 plan, validation, checklist, manual validation, changed-files, review-diff, and delta ZIP outputs.
+- Confirmed no `IMPLEMENTATION.md` file remains at the repository root.
 
 ## Validation Commands
 - PASS: `git status --short --branch`
 - PASS: `git rev-list --left-right --count origin/main...HEAD`
 - PASS: `git diff --name-only`
 - PASS: `git diff --check`
 - PASS: targeted retained-file existence checks.
+- PASS: targeted root `IMPLEMENTATION.md` absence check.
 - PASS: targeted changed-file scope check confirmed documentation/governance/report files only.
 
 ## Guardrails
 - No product files were modified.
 - No runtime code was modified.
+- No `IMPLEMENTATION.md` file remains at the repository root.
 - No branches were deleted.
 - `stash@{0}` was left untouched.
 - No leftover file was moved to `tmp/`.

docs_build/dev/reports/PR_26175_OWNER_055-legal-governance-leftover-retention_manual-validation-notes.md

@@ -1,7 +1,8 @@
 # PR_26175_OWNER_055-legal-governance-leftover-retention Manual Validation Notes
 
 ## Manual Review
-- Confirmed `IMPLEMENTATION.md` contains legal foundation implementation instructions/source notes rather than unrelated temporary content.
+- Confirmed `docs_build/legal/IMPLEMENTATION.md` contains legal foundation implementation instructions/source notes rather than unrelated temporary content.
+- Confirmed `IMPLEMENTATION.md` is not present at the repository root.
 - Confirmed `docs_build/legal/LEGAL_CHANGELOG.md` belongs to the legal foundation package governance notes.
 - Confirmed `docs_build/dev/reports/PR_26175_OWNER_current-open-pr-status.md` is a generated governance report snapshot.
 - Confirmed this PR does not intentionally alter product files, runtime code, UI, legal page rendering, branches, or stashes.

docs_build/dev/reports/PR_26175_OWNER_055-legal-governance-leftover-retention_requirement-checklist.md

@@ -5,7 +5,8 @@
 | PLAN_PR created | PASS | Added `docs_build/pr/PLAN_PR_26175_OWNER_055-legal-governance-leftover-retention.md`. |
 | BUILD_PR completed | PASS | Added this documentation/governance retention report bundle. |
 | APPLY_PR ready | PASS | Changes are scoped for a normal PR. |
-| Retain `IMPLEMENTATION.md` only if it contains legal package source notes | PASS | File contains legal foundation implementation instructions/source notes. |
+| Retain `docs_build/legal/IMPLEMENTATION.md` only if it contains legal package source notes | PASS | File contains legal foundation implementation instructions/source notes. |
+| Do not leave `IMPLEMENTATION.md` at repo root | PASS | Root file absent; retained copy is `docs_build/legal/IMPLEMENTATION.md`. |
 | Retain `docs_build/legal/LEGAL_CHANGELOG.md` only if it belongs to the legal package | PASS | File documents legal foundation package version 1.0. |
 | Retain current open PR status report only if creating report-retention PR | PASS | This PR is the report-retention/legal-governance follow-up. |
 | Do not modify product files | PASS | Only documentation/governance/report paths are changed. |

docs_build/dev/reports/PR_26175_OWNER_055-legal-governance-leftover-retention_validation-lane.md

@@ -11,6 +11,7 @@ Documentation/governance retention lane.
 | `git diff --name-only` | PASS |
 | `git diff --check` | PASS |
 | Required retained files exist | PASS |
+| Root `IMPLEMENTATION.md` absent | PASS |
 | Required OWNER_055 reports exist | PASS |
 | Changed-file scope excludes product/runtime files | PASS |
 | Delta ZIP exists under `tmp/` | PASS |

docs_build/dev/reports/PR_26175_OWNER_current-open-pr-status.md

@@ -18,7 +18,7 @@ This governance snapshot was refreshed after `PR_26175_OWNER_054-legal-corrected
 ## Retained Leftovers
 | Path | Classification | OWNER_055 disposition |
 | --- | --- | --- |
-| `IMPLEMENTATION.md` | Legal package implementation/source notes | Retain in legal governance follow-up PR. |
+| `docs_build/legal/IMPLEMENTATION.md` | Legal package implementation/source notes | Retain in legal governance follow-up PR. |
 | `docs_build/legal/LEGAL_CHANGELOG.md` | Legal foundation package governance notes | Retain in legal governance follow-up PR. |
 | `docs_build/dev/reports/PR_26175_OWNER_current-open-pr-status.md` | Generated governance status report | Retain as this refreshed snapshot. |
 

docs_build/dev/reports/codex_changed_files.txt

@@ -1,4 +1,3 @@
-IMPLEMENTATION.md
 docs_build/dev/reports/PR_26175_OWNER_055-legal-governance-leftover-retention.md
 docs_build/dev/reports/PR_26175_OWNER_055-legal-governance-leftover-retention_branch-validation.md
 docs_build/dev/reports/PR_26175_OWNER_055-legal-governance-leftover-retention_manual-validation-notes.md
@@ -7,5 +6,6 @@ docs_build/dev/reports/PR_26175_OWNER_055-legal-governance-leftover-retention_va
 docs_build/dev/reports/PR_26175_OWNER_current-open-pr-status.md
 docs_build/dev/reports/codex_changed_files.txt
 docs_build/dev/reports/codex_review.diff
+docs_build/legal/IMPLEMENTATION.md
 docs_build/legal/LEGAL_CHANGELOG.md
 docs_build/pr/PLAN_PR_26175_OWNER_055-legal-governance-leftover-retention.md