feat: add purgeInMemoryCaches() to DederProjectInternals

[sake92]

• Add CacheStatsRegistry.invalidateAll() to flush all registered Scaffeine caches
• Simplify CacheStatsRegistry.register() to accept SCache directly
• Add PurgeCachesResult case class + purgeInMemoryCaches() to DederProjectInternals
• Implement via callback pattern in DederProjectInternalsImpl
• Add DederBspServer.cleanupCompletedInFlight() for stale BSP entries
• Implement purge logic in DederProjectState with 10s idle wait, cache invalidation, history clearing, BSP cleanup, and GC suggestion
• Wire callback in ServerMain
• Add unit test for invalidateAll()

Summary by CodeRabbit

• New Features

  • Added cache purging capability with detailed reporting on cleared caches, removed entries, and memory management suggestions.
  • Enhanced Zinc compiler with additional analysis caching to reduce disk I/O.
  • Improved memory management with coordinated in-flight request drainage before cache clearing.

• Bug Fixes

  • Better cleanup of completed compilation entries to prevent memory leaks.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ba17cd17-6190-4841-9282-68d00f6e173b

📥 Commits

Reviewing files that changed from the base of the PR and between 8e72096 and 9faa55d.

📒 Files selected for processing (11)

• deder-common/src/ba/sake/deder/DederProjectInternals.scala
• server/src/ba/sake/deder/CacheStatsRegistry.scala
• server/src/ba/sake/deder/DederProjectInternalsImpl.scala
• server/src/ba/sake/deder/DederProjectState.scala
• server/src/ba/sake/deder/ServerMain.scala
• server/src/ba/sake/deder/bsp/DederBspServer.scala
• server/src/ba/sake/deder/deps/DependencyResolver.scala
• server/src/ba/sake/deder/testing/inmemory/InMemoryTestOrchestrator.scala
• server/src/ba/sake/deder/zinc/ZincCompiler.scala
• server/src/ba/sake/deder/zinc/ZincCompilersCache.scala
• server/test/src/ba/sake/deder/CacheStatsRegistrySuite.scala

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📝 Walkthrough

Walkthrough

Adds a structured PurgeCachesResult return type to purgeInMemoryCaches(). Refactors CacheStatsRegistry to store live cache instances and adds invalidateAll(). Implements coordinated purge orchestration in DederProjectState that drains in-flight requests before invalidating caches, cleaning BSP entries, and clearing history. Wires the new function in ServerMain. Adds an analysisCache in ZincCompiler.

Changes

Cache Purge Implementation

Layer / File(s)	Summary
PurgeCachesResult type and method contract deder-common/src/ba/sake/deder/DederProjectInternals.scala	Adds PurgeCachesResult case class with cachesCleared, bspEntriesRemoved, historyEntriesRemoved, gcSuggested fields, and updates purgeInMemoryCaches() to return it.
CacheStatsRegistry refactor, callsite updates, and tests server/src/ba/sake/deder/CacheStatsRegistry.scala, server/src/ba/sake/deder/deps/DependencyResolver.scala, server/src/ba/sake/deder/testing/inmemory/InMemoryTestOrchestrator.scala, server/src/ba/sake/deder/zinc/ZincCompiler.scala, server/src/ba/sake/deder/zinc/ZincCompilersCache.scala, server/test/src/ba/sake/deder/CacheStatsRegistrySuite.scala	CacheStatsRegistry switches from () => InMemCacheStats suppliers to storing SCache instances, adds invalidateAll(), and updates all registration callsites. ZincCompiler gains a new analysisCache. Tests are updated and a new invalidateAll test is added.
Purge orchestration, BSP cleanup, and server wiring server/src/ba/sake/deder/DederProjectInternalsImpl.scala, server/src/ba/sake/deder/bsp/DederBspServer.scala, server/src/ba/sake/deder/DederProjectState.scala, server/src/ba/sake/deder/ServerMain.scala	Adds purgeCachesFn delegate and clearHistory() to DederProjectInternalsImpl, cleanupCompletedInFlight() to DederBspServer, and the full purgeInMemoryCachesImpl() orchestration in DederProjectState. ServerMain wires purgeCachesFn to the implementation.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐇 Hop, hop, the caches grow stale,
But now we can purge without fail!
We wait for in-flight to land,
Then wipe with a capable hand—
GC suggested, results in paw,
The cleanest build you ever saw! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/purge-inmemory-caches

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