v0.4.0

Added

• Session-start catalog advertisement, fixing proactive-capability discoverability. The catalog
  used to be pull-only (visible only in a list_capabilities result), so a capability the agent
  should call unprompted was never triggered — nothing in the agent's context mentioned it. Now
  the MCP initialize handshake's server instructions list every enabled capability's name +
  summary, and capabilities marked with the new per-capability promote flag (default false)
  get their full instructions hoisted in as well (capped at 2,000 chars each, with a pointer to
  list_capabilities for the full text). The list_capabilities tool description also gains a
  generated "Currently registered: …" suffix. list_capabilities/discover_tools/route
  behavior is unchanged; the advertisement is a per-session snapshot (in central mode, taken
  after the initial fetch). The committed central example catalog promotes Unwritten.
• The advertisement block as a whole is budgeted at 1,900 characters (Claude Code was observed
  to truncate rendered server instructions at ~2,048). Spent in priority order — header and all
  name/summary lines first, then promoted instructions in catalog order; the first entry that
  doesn't fit is truncated with the list_capabilities pointer, later promoted entries are
  omitted, and a startup warning names the affected capabilities. The example catalog's
  Unwritten entry was tightened to fit the budget whole.