docs(correlation): record #5991 RRF decision

[koala73]

Summary

• Adds a concise repository-conventional discovery record for discovery(correlation): evaluate reciprocal-rank-fusion story ranking #5991.
• Freezes the representative replay tick, current topic-grouped top 12, naive source-label RRF comparison, and explicit reject/defer decision.
• Distinguishes feed-label syndication from independent corroboration and records the current embedding/replay state.

Intent

This is analysis-only. It does not implement ranking, add a ranking abstraction, mutate runtime configuration, close or comment on #5991, or expand into #5992.

Validation Matrix

• PASS — markdownlint on the changed Markdown file.
• PASS — npm run docs:check (121 doc claims).
• PASS — public-doc plan-reference check.
• PASS — Unicode safety and staged git diff --check.
• N/A — code/typecheck/tests; the PR changes documentation only.

Review Gates

• PASS — baseline Reviewer: all discovery(correlation): evaluate reciprocal-rank-fusion story ranking #5991 acceptance fields are explicit.
• PASS — Code Review Expert: docs-only diff; no code, secret, runtime, or new abstraction finding.
• PASS — Outcome Reviewer: evidence supports rejecting this naive candidate and deferring reconsideration pending independent-source and multi-tick evidence.
• No reviewers requested.

Documentation

• Added docs/solutions/best-practices/source-label-rrf-needs-independent-corroboration.md.

Screenshots/UI Evidence

• N/A — documentation-only change; the fixed-sample tables are the review surface.

Residual Findings

• discovery(correlation): evaluate reciprocal-rank-fusion story ranking #5991 remains open and untouched; this PR makes the prior decision durable.
• Production replay logging is currently off, and DIGEST_DEDUP_REMOTE_EMBED_ENABLED is set but has no repository consumer or shadow/flip lane.
• discovery(correlation): evaluate hybrid semantic and structural similarity #5992 remains a separate blocked implementation issue; no prerequisite tracker state was mutated.

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