feat(q3): predictive prefetch MVP — anticipate file reads via import graph#77
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…graph Q3 supporting pillar MVP from the northstar plan. When ashlr__read succeeds on a file, a fire-and-forget background task scans the file's imports (lightweight regex — no AST), resolves the top-N neighbors, and pre-warms the snipCompact cache so the next ashlr__read on any of them is instant. Target cold-start improvement: 30-60% on subsequent reads. Tier gates (hardcoded first line of schedulePrefetch): - Free → no work, returns immediately. - Pro → top 3 neighbors. - Team → top 10 neighbors. Constraints respected: - Hard 1.5s wallclock cap. Background task cancels after. - Never blocks the main read path (setImmediate-deferred + no await). - Path traversal guarded to project cwd (security). - ASHLR_PREFETCH=off kill switch documented in docs/operations.md. - Idempotent — re-prefetch of cached path is no-op. Import patterns covered: TS/JS (import/from/require), Python (from/import), basic C/C++ (#include). Skips node_modules and any non-resolvable paths. Telemetry: prefetch_scheduled + prefetch_hit structured events with neighbors_scheduled, neighbors_completed, duration_ms. Tests: 20 new, all green. Tier matrix + kill switch + idempotency + 1.5s budget + cwd-traversal guard + cache hit verified. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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First Q3 supporting pillar (Predictive Prefetch). When ashlr__read fires, a fire-and-forget task pre-warms the snipCompact cache for the top-N imported neighbors. Pro=3, Team=10, free=disabled. 1.5s hard wallclock cap, ASHLR_PREFETCH=off kill switch.
Tests
Cold-start delta