v0.3.0

Added

• Watch subscriptions with status, file diffs, and explicit acknowledgement
  through skill watch add, watch diff, and watch seen.
• Unified file diffs for update previews, with readable summaries and paths.

Changed

• Rebuilt the CLI on shared agents core with agents.json declarations and
  agents.resolved locks in project .agent/ or user ~/.agents/. Skill names
  are positional arguments; updates preview changes before --apply writes.
  Existing 0.2 state is not read, and 0.2 installations are never replaced:
  move or remove them, then add sources and watch subscriptions again.
  See upgrading from 0.2.

Removed

• The 0.2 watch ledger and review commands; watch now uses subscriptions.

Fixed

• Git failures now include concise diagnostics and recovery guidance.
• Adding or installing a skill never replaces a directory, file, or link that
  the scope's lock does not manage, such as a hand-written skill.