docs: refresh README + CHANGELOG for 2026-05-15 postgres cutover complete - #81
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…lete README header was stale: said \"JP's fork of milla-jovovich/mempalace\" (actual upstream is MemPalace/mempalace), pointed at jphein/* shields and links (we transferred to techempower-org), reported a 160K-drawer chromadb palace (now 273K-drawer postgres+pgvector+AGE), and described the substrate cutover as in-flight on feat/pgvector-age-impl (cutover shipped to main on 2026-05-13–15). Refreshes: * Title + author line + shield links → techempower-org * Production palace size + backend → 273K-drawer postgres * Substrate section status block → shipped, with refs to the operator runbook and bench artifact * Storage layer bullet → "main as of 2026-05-15; chromadb path still works behind MEMPALACE_BACKEND=chroma" CHANGELOG: new [Unreleased] section above [3.3.5] capturing the fork-side work that landed 2026-05-14 / 2026-05-15 — postgres cutover, hybrid retrieval (vector ∪ BM25 ∪ graph), symbol_header_prefix kwarg, n=200 git-derived probe set, RRF verifier (2-way + 3-way), bench captures, the pgvector lazy-index race fix, the EmbeddingFunction .embed_query doc note, and the @nakata-app MemPalace#1490 cherry-pick. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
README header was stale; CHANGELOG was last touched at `[3.3.5] — 2026-05-09`. This PR refreshes both to reflect that the substrate cutover finished, the fork moved to `techempower-org`, and 8/9 bench suites pass on the new backend.
What was stale
CHANGELOG `[Unreleased]` adds
Out of scope
Three sections still reference "in-flight" / "cherry-pick" framings — those entries are correct historical narrative for what was done (specific commits cherry-picked from upstream PRs at specific dates), so leaving them alone. A future pass can decide whether to reframe as "historical inventory".
Test plan
🤖 Generated with Claude Code