cc10x Update

Safe upgrade that preserves your local modifications to cached skill files.

Workflow: Discover versions → Stash local diffs → Pull upstream → Rebuild cache → Rebase patches → Verify.

Paths (Resolve Once)

Resolve these paths at the start and reuse throughout. All paths are deterministic from the plugin registry.

REGISTRY="$HOME/.claude/plugins/installed_plugins.json"
KNOWN_MARKETPLACES="$HOME/.claude/plugins/known_marketplaces.json"
CACHE_ROOT="$HOME/.claude/plugins/cache/cc10x/cc10x"
BACKUP_DIR="$HOME/.claude/plugins/cache/cc10x/_backup_$(date +%Y%m%d_%H%M%S)"