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Merge pull request #210 from ToolboxAid/PR_26177_002-shared-noise-foundation
PR_26177_002-shared-noise-foundation
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‎docs_build/dev/BUILD_PR.md‎

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# PR_26177_001-shared-hash-foundation
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# PR_26177_002-shared-noise-foundation
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## Purpose
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Add a small shared non-cryptographic hash foundation.
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Add a small shared deterministic noise foundation.
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## Source Of Truth
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This `BUILD_PR.md`, `PLAN_PR.md`, and the user request are the source of truth for `PR_26177_001-shared-hash-foundation`.
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This `BUILD_PR.md`, `PLAN_PR.md`, and the user request are the source of truth for `PR_26177_002-shared-noise-foundation`.
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## Stack
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- Base branch: `PR_26177_001-shared-hash-foundation`
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- This PR builds on PR_001 hash utilities.
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## Exact Scope
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- Add `src/shared/hash/` foundation.
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- Include deterministic non-crypto hash helpers.
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- No browser-owned product data.
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- No runtime UI changes.
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- Add targeted tests for the shared hash area.
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- Add `src/shared/noise/` foundation.
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- Build on existing `Random`/`RandomSeed` and PR_001 hash utilities.
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- Include deterministic Value, Perlin-style, Simplex-style, and Fractal-style helpers only where practical.
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- Keep API small and documented.
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- Add targeted tests for the shared noise area.
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- Create required Codex reports under `docs_build/dev/reports/`.
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- Create repo-structured delta ZIP under `tmp/`.
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## Exact Targets
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- `docs_build/dev/PLAN_PR.md`
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- `docs_build/dev/BUILD_PR.md`
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- `src/shared/hash/hash.js`
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- `tests/shared/HashFoundation.test.mjs`
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- `docs_build/dev/reports/PR_26177_001-shared-hash-foundation.md`
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- `docs_build/dev/reports/PR_26177_001-shared-hash-foundation_branch-validation.md`
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- `docs_build/dev/reports/PR_26177_001-shared-hash-foundation_requirement-checklist.md`
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- `docs_build/dev/reports/PR_26177_001-shared-hash-foundation_validation-lane.md`
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- `docs_build/dev/reports/PR_26177_001-shared-hash-foundation_manual-validation-notes.md`
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- `src/shared/noise/noise.js`
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- `tests/shared/NoiseFoundation.test.mjs`
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- `docs_build/dev/reports/PR_26177_002-shared-noise-foundation.md`
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- `docs_build/dev/reports/PR_26177_002-shared-noise-foundation_branch-validation.md`
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- `docs_build/dev/reports/PR_26177_002-shared-noise-foundation_requirement-checklist.md`
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- `docs_build/dev/reports/PR_26177_002-shared-noise-foundation_validation-lane.md`
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- `docs_build/dev/reports/PR_26177_002-shared-noise-foundation_manual-validation-notes.md`
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- `docs_build/dev/reports/codex_review.diff`
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- `docs_build/dev/reports/codex_changed_files.txt`
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## Out Of Scope
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- No cryptographic hashing.
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- No browser-owned product data.
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- No runtime UI changes.
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- No browser storage changes.
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Run exactly:
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```powershell
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node ./scripts/run-node-test-files.mjs tests/shared/HashFoundation.test.mjs
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node --check src/shared/hash/hash.js
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node --check tests/shared/HashFoundation.test.mjs
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node ./scripts/run-node-test-files.mjs tests/shared/NoiseFoundation.test.mjs tests/shared/HashFoundation.test.mjs
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node --check src/shared/noise/noise.js
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node --check tests/shared/NoiseFoundation.test.mjs
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git diff --check
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```
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Create repo-structured delta ZIP:
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```text
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tmp/PR_26177_001-shared-hash-foundation_delta.zip
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tmp/PR_26177_002-shared-noise-foundation_delta.zip
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```

‎docs_build/dev/PLAN_PR.md‎

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# PLAN_PR: PR_26177_001-shared-hash-foundation
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# PLAN_PR: PR_26177_002-shared-noise-foundation
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## Purpose
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Add a small shared non-cryptographic hash foundation.
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Add a small shared deterministic noise foundation.
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## Scope
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- Add `src/shared/hash/` foundation.
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- Include deterministic non-crypto hash helpers.
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- Add targeted unit tests.
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- Add `src/shared/noise/` foundation.
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- Build on existing `RandomSeed` and PR_001 hash utilities.
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- Include deterministic Value, Perlin-style, Simplex-style, and Fractal-style helpers where practical.
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- Keep API small and documented.
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- Add targeted tests.
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- No browser-owned product data.
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- No runtime UI changes.
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- No unrelated cleanup.
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## Implementation Plan
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1. Add `src/shared/hash/hash.js` with deterministic stable string and FNV-1a based helpers.
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2. Add `tests/shared/HashFoundation.test.mjs`.
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3. Validate determinism, object key ordering, seed variation, combination, and normalized hash output.
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1. Add `src/shared/noise/noise.js`.
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2. Add `tests/shared/NoiseFoundation.test.mjs`.
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3. Validate deterministic output, seed variation, practical ranges, and permutation determinism.
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4. Produce required Codex reports and repo-structured ZIP.
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## Acceptance Criteria
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- Hash helpers are deterministic for identical values.
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- Object hashing is stable regardless of property insertion order.
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- Helpers are documented as non-cryptographic.
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- No browser storage, UI, API, database, or sample smoke changes are introduced.

‎docs_build/dev/reports/PR_26177_002-shared-noise-foundation.md‎

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# PR_26177_002-shared-noise-foundation
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Date: 2026-06-26
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Scope: Shared deterministic noise foundation
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Status: PASS
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## Summary
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- Added `src/shared/noise/noise.js`.
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- Added deterministic value, Perlin-style, Simplex-style, fractal, and seeded permutation helpers.
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- Built on PR_001 hash utilities and existing `RandomSeed`.
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- Added targeted tests in `tests/shared/NoiseFoundation.test.mjs`.
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- No browser-owned product data, runtime UI, API, database, or unrelated cleanup changes were made.
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## Validation
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- PASS: `node ./scripts/run-node-test-files.mjs tests/shared/NoiseFoundation.test.mjs tests/shared/HashFoundation.test.mjs`.
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- PASS: `node --check src/shared/noise/noise.js`.
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- PASS: `node --check tests/shared/NoiseFoundation.test.mjs`.
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- PASS: `git diff --check`.
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## Artifact
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- `tmp/PR_26177_002-shared-noise-foundation_delta.zip`

‎docs_build/dev/reports/PR_26177_002-shared-noise-foundation_branch-validation.md‎

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# PR_26177_002-shared-noise-foundation Branch Validation
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Status: PASS
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- PASS: Branch `PR_26177_002-shared-noise-foundation` was created from `PR_26177_001-shared-hash-foundation`.
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- PASS: Stack base was clean before branch creation.
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- PASS: One PR purpose only: shared noise foundation.
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- PASS: No `start_of_day` files changed.

‎docs_build/dev/reports/PR_26177_002-shared-noise-foundation_manual-validation-notes.md‎

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# PR_26177_002-shared-noise-foundation Manual Validation Notes
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Status: PASS
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Manual review confirmed the noise helpers are deterministic, small, documented, stacked on the hash foundation, and isolated from UI, browser product-data ownership, API, and database behavior.

‎docs_build/dev/reports/PR_26177_002-shared-noise-foundation_requirement-checklist.md‎

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# PR_26177_002-shared-noise-foundation Requirement Checklist
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| Requirement | Status | Notes |
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|---|---:|---|
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| Add `src/shared/noise/` foundation | PASS | Added `src/shared/noise/noise.js`. |
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| Build on Random/RandomSeed and PR_001 hash utilities | PASS | Uses `RandomSeed` and hash helpers. |
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| Include deterministic Value helpers where practical | PASS | Added `valueNoise2D`. |
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| Include deterministic Perlin helpers where practical | PASS | Added `perlinNoise2D`. |
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| Include deterministic Simplex helpers where practical | PASS | Added `simplexNoise2D`. |
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| Include deterministic Fractal helpers where practical | PASS | Added `fractalNoise2D`. |
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| Keep API small and documented | PASS | Added a compact documented helper set. |
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| Add targeted tests | PASS | Added `tests/shared/NoiseFoundation.test.mjs`. |
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| No runtime UI changes | PASS | No UI files changed. |

‎docs_build/dev/reports/PR_26177_002-shared-noise-foundation_validation-lane.md‎

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# PR_26177_002-shared-noise-foundation Validation Lane
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Status: PASS
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## Commands
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```powershell
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node ./scripts/run-node-test-files.mjs tests/shared/NoiseFoundation.test.mjs tests/shared/HashFoundation.test.mjs
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node --check src/shared/noise/noise.js
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node --check tests/shared/NoiseFoundation.test.mjs
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git diff --check
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```
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## Results
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- PASS: Targeted noise and hash tests.
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- PASS: Changed JS syntax checks.
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- PASS: `git diff --check`.
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## Not Run
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- Full samples smoke was not run by default.

‎docs_build/dev/reports/codex_changed_files.txt‎

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docs_build/dev/BUILD_PR.md
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docs_build/dev/PLAN_PR.md
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docs_build/dev/reports/PR_26177_001-shared-hash-foundation.md
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docs_build/dev/reports/PR_26177_001-shared-hash-foundation_branch-validation.md
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docs_build/dev/reports/PR_26177_001-shared-hash-foundation_manual-validation-notes.md
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docs_build/dev/reports/PR_26177_001-shared-hash-foundation_requirement-checklist.md
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docs_build/dev/reports/PR_26177_001-shared-hash-foundation_validation-lane.md
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docs_build/dev/reports/PR_26177_002-shared-noise-foundation.md
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docs_build/dev/reports/PR_26177_002-shared-noise-foundation_branch-validation.md
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docs_build/dev/reports/PR_26177_002-shared-noise-foundation_manual-validation-notes.md
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docs_build/dev/reports/PR_26177_002-shared-noise-foundation_requirement-checklist.md
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docs_build/dev/reports/PR_26177_002-shared-noise-foundation_validation-lane.md
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docs_build/dev/reports/codex_changed_files.txt
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docs_build/dev/reports/codex_review.diff
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src/shared/hash/hash.js
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tests/shared/HashFoundation.test.mjs
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src/shared/noise/noise.js
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tests/shared/NoiseFoundation.test.mjs

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