docs: record data-layer D3b quality-report progress

[StackOverFlow11]

Summary

Docs-only progress sync recording Data Layer D3b (the default-off data-update quality-report hook) as implemented. No code change.

PR #47 merge status

MERGED into main (mergeCommit b21b5f6). D3b code accepted by Codex; this PR only updates documentation to match.

Changed files (3, docs only)

• docs/data/data_layer_contracts.md — D3b recorded as implemented alongside D3 (default-off data-update quality-report hook; report-only Markdown artifact under output.report_dir; structural checks only; no job failure; no filtering/repairing; no cache/feed/backtest semantic change). The old "D3b deferred" wording is removed; D4-D6 stay explicitly unimplemented.
• CLAUDE.md — PR feat(data): D3b default-off data-update quality-report hook #47 added to the merged-PR list; D3b progress bullet; quality gate 625 → 643 passed; roadmap next data-layer step is D4 CoverageLedger storage scaling / batch writes (D5 concurrency / endpoint schema registry remain unimplemented).
• AGENTS.md — made byte-identical to CLAUDE.md.

D3b scope (as recorded)

Strict data_update.quality config (enabled=false default ⇒ every existing config unchanged); supported quality endpoints market_daily / adj_factor / stk_mins_1min; report written under output.report_dir with bounded/redacted findings + symbol count only; no extra API call beyond the frames the updater already warmed; report-only — no job failure, no cache/feed/backtest behavior change.

D4 / scaling / concurrency / schema registry — NOT started

Confirmed. This is a publish + docs-sync task only; no D4 / CoverageLedger storage scaling / batch writes / concurrency / schema registry / fail_on_hard was started.

Verification (Step 4)

• git diff --name-only main...HEAD → only AGENTS.md, CLAUDE.md, docs/data/data_layer_contracts.md (docs only).
• cmp -s AGENTS.md CLAUDE.md → identical.
• git diff --check main...HEAD → clean; merge-marker scan → NO_MERGE_MARKERS.
• stale-text scan: no 625 passed, no "D3b deferred/unimplemented" residual; 643 passed recorded; D4-D6 not claimed implemented.
• docs-only ⇒ full pytest not required (D3b suite already green at 643 on feat(data): D3b default-off data-update quality-report hook #47).

PR #38 untouched

Confirmed: #38 OPEN base=feat/i5c-mmp-minute-factor — not merged, closed, retargeted, or edited.