- Add extension-manifest.ts and extension-sort.ts to pi-coding-agent
with manifest reading and Kahn's BFS topological sort algorithm
- Add extensionPathsTransform hook to DefaultResourceLoader that runs
between path merging and loadExtensions() — enables pre-load
filtering and reordering without modifying pi internals
- Wire GSD's buildResourceLoader() to provide a transform that:
1. Filters ALL extensions (including community) through the GSD registry
2. Sorts in topological dependency order via sortExtensionPaths()
- Mark discoverAndLoadExtensions() as @deprecated (dead code path)
- Add 16 tests covering manifest reading, dependency sorting, cycles,
missing deps, and non-array deps
Previously, dependencies.extensions in manifests was decorative (sort
existed but was never called), and gsd extensions disable only worked
for bundled extensions. Community extensions in ~/.gsd/agent/extensions/
bypassed the registry entirely.
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