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## Why CCA thread startup loads repository skills through the primary remote environment. This still used the older host skill loader, which recursively issued directory and metadata requests over the exec-server connection. On a high-latency connection, one skill scan could turn into hundreds of round trips. Executor-selected skill roots already avoid this pattern: they use one bounded filesystem walk, reuse the returned inventory, and overlap independent reads. ## What changed - Extract the URI-native walk inventory into a shared private discovery module. - Use that discovery path for both environment-owned and host/repository skill roots. - Reuse the walk inventory to avoid per-skill metadata existence checks when the inventory is complete. - Canonicalize host skill identities and parse skill files with bounded concurrency. - Prune hidden host directories during traversal, preserving visible aliases and walk limits. - Cache namespace probes by ancestor and keep all remote namespace reads under the same concurrency bound. - Keep safe metadata probes for incomplete walks, file symlinks, and case aliases. ## Dependency #31570 is now merged. It provides the optional `pruneHiddenDirectories` walk flag used here. That flag defaults to false and is omitted when disabled. No other exec-server API changes are introduced.