fix(continual-learning): support persistent workspace exclusions

[rohan-patnaik]

Refs #141 (workspace exclusions).

Add excludedPaths in ~/.cursor/continual-learning.json, with an optional CONTINUAL_LEARNING_CONFIG path override. A listed directory and its descendants skip the stop-hook trigger before any state writes. Path matching resolves symlink aliases and does not match sibling prefixes. The continual-learning skill passes the helper path and workspace to the updater, which checks the same setting for manual runs.

Missing config preserves current behavior. Invalid or unreadable config stops learning and reports an error. Cadence and memory-file settings are unchanged; Git remote owner/slug matching is outside this change.

Validation: 13 Bun tests pass, including an actual stop-hook regression that fails before the hook change, allowed-workspace behavior, malformed config, descendants and symlinks. The helper also runs with CURSOR_PLUGIN_ROOT absent and a space-containing install path. git diff --check passes.

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Note

Medium Risk
Changes when learning runs and reads user config from disk; misconfiguration or strict validation could block learning, but scope is limited to the continual-learning plugin hooks and updater flow.

Overview
Adds persistent workspace exclusions so continual learning can be turned off for specific local directories via ~/.cursor/continual-learning.json (excludedPaths of absolute paths), with optional CONTINUAL_LEARNING_CONFIG override.

A new workspace-exclusions helper resolves symlinks, matches a path and its descendants (not prefix siblings), treats a missing config as “not excluded,” and throws on invalid config so learning does not run silently. The stop hook bails out before cadence state or follow-up triggers when excluded; the continual-learning skill passes the installed helper path and workspace to agents-memory-updater, which must run the helper with bun run before reading transcripts or updating AGENTS.md. Docs and focused Bun tests cover hook behavior, manual updater path, symlinks, and malformed config.

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