skillscript-runtime v0.4.4

Dashboard SPA Connectors view shows the wired registry. Closes the
"dashboard MCP view" gap (per 08a08316): pre-v0.4.4 the SPA's
#connectors tab showed only post-hoc activity metrics from
health_metrics, so a user could wire YouTrack through connectors.json
and see an empty page until a skill actually exercised it.

Fixed

• renderConnectors() polls runtime_capabilities and renders the
  full wired registry (MCP, Local model, Memory store, Skill store,
  Agent) above the existing activity-metrics table. Each entry shows
  class, contract version, and (for MCP) the effective allowed_tools
  allowlist from v0.4.1. Available MCP classes for connectors.json
  surface as a footer note (closed-set registry from v0.4.0).

• state.capabilities field populates on every poll (30s cadence).
  Refresh path is runtime_capabilities alongside the existing
  skill_list / list_triggers / health_metrics calls.

Implementation notes

• SPA-only change. No runtime / parser / lint impact. The
  runtime_capabilities MCP tool already surfaced the full registry
  shape (v0.4.0 + v0.4.1); this release wires the SPA to consume it.
• Tests: 5 new in tests/v0.4.4.test.ts covering source-level
  wiring (polling, render, allowlist, classes) + dist/ build
  verification (so deployed dashboards get the fix).
• LOC unchanged. SPA changes don't count against narrow core; no
  ceiling impact.