Start per-table hooks while the walk is still running

packages/python/e2e-attestations/bot-speed-parse-overlap-1011.json

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+{
+  "command": "uv run python -m pytest tests/e2e/jsonl_parse_speed_test.py tests/e2e/frontmatter_parse_speed_test.py tests/e2e/on_file_query_test.py tests/e2e/query_contract_test.py -x -q",
+  "ran_at": 1791768023,
+  "exit_code": 0,
+  "commit": "db8e06627eb807a3932ae3989ef662019a288ce1",
+  "branch": "bot/speed-parse-overlap-1011"
+}

packages/rust/changelog.d/2026-10-11-hooks-start-during-the-walk.md

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+**Changed**
+
+- **A per-table command now starts parsing while the startup walk is still finding files.** A frontmatter table over 65,000 notes indexes about 5-15ms sooner on a loaded machine and about 15ms sooner on a restricted-CPU one. Output is unchanged.

packages/rust/migrations.d/2026-10-11-hooks-start-during-the-walk.md

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+### Per-table commands start during the walk
+
+#### Summary
+
+A per-table `on_file` command is spawned as soon as the startup walk matches its first file, rather than after the walk ends. Rows and their content are unchanged; nothing breaks.
+
+#### Required changes
+
+_None._
+
+#### Deprecations removed
+
+_None._
+
+#### Behavior changes without code changes
+
+_None._
+
+#### Verification
+
+```bash
+dirsql query "SELECT status, count(*) FROM notes GROUP BY status"
+```
+
+Prints the same rows as before, sooner on a large tree.