Rotorsoft / act-root / 25010661003

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fix(act-sqlite): tighten regex→LIKE stream pattern conversion

Honor `^` and `$` anchors so anchored regex sources translate to the
right LIKE shape (exact, starts-with, ends-with) instead of being
matched literally. Unanchored input is %-padded as a contains match.
Adjacent `%` is collapsed for cleaner output.

The helper is now shared between query() and claim(); claim() was
previously duplicating the raw regex-to-LIKE translation. Extracted
as `streamPatternToLike` and exported for direct unit testing.

Tests:
- new test/stream-pattern.spec.ts: 15 unit tests covering all anchor
  combinations, `.*`/`.` wildcards, edge cases, realistic patterns
- store.spec.ts: 4 new integration tests for anchored queries
  (`^prefix.*`, `.*suffix$`, `^exact$`) and claim() with regex source

50 tests, 100% statements/branches/functions/lines coverage on
SqliteStore.ts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1241 of 1241 branches covered (100.0%)

Branch coverage included in aggregate %.

9 of 9 new or added lines in 1 file covered. (100.0%)

2188 of 2188 relevant lines covered (100.0%)

76.37 hits per line