MR-793 follow-up: lance docs alignment audit + mandate full-page fetch via mdrip

* AGENTS.md / docs/lance.md: agents must use `npx mdrip` (not summarizing
  WebFetch) when consulting Lance docs. WebFetch routinely drops
  load-bearing details — `pub(crate)` blockers, sub-specs behind nav hubs,
  default flags. Lesson learned during the MR-793 alignment audit.
* docs/lance.md: add "Last alignment audit: 2026-05-02" stanza
  documenting MemWAL gap, lance#6666 companion ticket, stable-row-ID
  status (experimental, may unblock MR-848), FRI as documented
  compaction-friendly alternative.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Ragnor Comerford 2026-05-02 17:41:32 +02:00
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@ -5,7 +5,7 @@ This file is the always-on map for AI coding agents (Claude Code, Codex, Cursor,
**Required reading every session, every change:**
1. **[docs/invariants.md](docs/invariants.md)** — the architectural invariants and §IX deny-list. Apply to every PR, not only architecture work.
2. **[docs/lance.md](docs/lance.md)** — the curated index of upstream Lance docs. **Consult it before every task** to identify which Lance pages are relevant to what you're about to do, then fetch those upstream URLs before grepping our code or guessing. Lance is the substrate; behavior is documented there, not here.
2. **[docs/lance.md](docs/lance.md)** — the curated index of upstream Lance docs. **Consult it before every task** to identify which Lance pages are relevant to what you're about to do, then fetch those upstream URLs before grepping our code or guessing. Lance is the substrate; behavior is documented there, not here. **Always fetch the FULL page content, not summaries** — use `npx mdrip <url>` (or `npx mdrip --max-chars 200000 <url>` for very long pages). Tools that summarize pages (like Claude's `WebFetch`) drop load-bearing details — we have caught alignment misses (default flags, `pub(crate)` blockers, three-page sub-specs hidden behind navigation hubs) only after dumping the full markdown. If `npx mdrip` is unavailable, fall back to `curl <url> | pandoc -f html -t markdown` or paste the rendered page text manually; never act on a summarized fetch alone.
3. **[docs/testing.md](docs/testing.md)** — the test-coverage map. **Always check what already covers your change before writing a new test.** Extending an existing test (an assertion, a fixture row, a parameterization) is preferred over a duplicated `init_and_load()` block. Walk the before-every-task checklist to identify existing coverage, run those tests as a clean baseline, and only add a new test fn or file when no existing one owns the area.
Tools that support `@`-imports (Claude Code) auto-include all three files via the imports below — note these must sit at column 0 (not inside a blockquote) for the parser to recognize them. Other agents (Codex, Cursor, Cline, …) must open them explicitly at the start of each session.