Codebase/Colocated Rules Cache

[RomneyDa]

Description

A major source of slow config loading is walk dir to find colocated rules.md files. This PR adds a codebase/colocated rules cache that initializes on startup and then updates and triggers a config reload when a rules.md file is edited. This way it's not doing a full walk dir for any config reload.

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Summary by cubic

Added a cache for codebase colocated rules.md files to speed up config loading. The cache initializes on startup and updates when a rules.md file is edited, avoiding full directory scans on each config reload.

• Performance
  • Config reloads now use the cached rules, reducing file system operations.
  • Editing a rules.md file updates the cache and triggers a config reload automatically.

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[cubic-dev-ai]

cubic found 1 issue across 8 files. Review it in cubic.dev

_{React with 👍 or 👎 to teach cubic. Tag @cubic-dev-ai to give specific feedback.}

[cubic-dev-ai]

doLoadConfig relies on the cache being populated, but it never calls await codebaseRulesCache.refresh(ide) (or checks that it has already run). If this function executes before another component refreshes the cache, codebaseRulesCache.rules and errors will both be empty, silently dropping colocated rules from the loaded config.