feat: implement per file metadata in cli

[nainglinnkhant]

Note

Adds --metadata-file support to upload and sync, enables metadata-aware change detection/merging, introduces metadata utilities, updates tests, and adds fast-deep-equal.

• CLI:
  • Upload (packages/cli/src/commands/store/upload.ts):
    • Add --metadata-file <file> (JSON/YAML) and merge per-file metadata with --metadata.
    • Validate mutual exclusivity with --manifest and improve file discovery messaging.
  • Sync (packages/cli/src/commands/store/sync.ts):
    • Add --metadata-file <file> and load per-file metadata map.
    • Pass metadata map to analysis/execution; integrate into options.
• Sync Logic (packages/cli/src/utils/sync.ts):
  • Detect metadata changes via new per-file mapping; track contentChanged and metadataChanged.
  • Enhance change summary with indicators; merge metadata with precedence (CLI < per-file < sync fields).
• Metadata Utilities (packages/cli/src/utils/metadata-file.ts):
  • New helpers: loadMetadataMapping, normalizePathForMetadata, extractUserMetadata, metadataEquals (uses fast-deep-equal).
  • Extend FileSyncMetadata to allow extra keys (packages/cli/src/utils/sync-state.ts).
• Hash Utils (packages/cli/src/utils/hash.ts):
  • Remove unused calculateHash; keep file hashing and comparison.
• Tests:
  • Add comprehensive tests for per-file metadata in upload/sync and metadata utils; adjust existing sync/upload tests.
• Dependencies:
  • Add fast-deep-equal.
• Docs:
  • Update CLAUDE.md to pnpm workspaces v10.15.0.

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