docs: scope requirement response ETags

[JustAGhosT]

Summary\nClarify the one late Codex finding from merged PR #103:\n- each canonical requirement JSON record carries its raw concurrency token\n- only a response representing one requirement emits that token as the HTTP ETag\n- task-list/task-detail responses do not derive a response ETag from one nested requirement\n\nVerification: one documentation line, git diff --check passed, exact-head CI required.\nBaton task: 0faa9f0a-8ffb-4d3d-9c3a-3c7a9af301a6. Funding impact: none.

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• docs/specs/SPEC-001-documentation-requirements.md

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[JustAGhosT]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: a9c60c7ec9

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