v0.31.3 — agent-stack

• Every skill description now fits a budget of about 300 characters (hub board row B-255 (a)):
  Claude Code lists every installed skill's description each session against a shared budget of
  about 30,000 characters, and the operator's listing measured 51,178, so less-used skills lost
  their descriptions. Measured with whitespace collapsed: agent-evals 422 → 294, agent-harness
  445 → 291, agent-interop 368 → 299, agent-orchestrator 458 → 299; total 1693 → 1183.
• Each description keeps its router sentence, its boundary against sibling skills, the opt-out
  phrase and a short English and Russian trigger list. Every quoted trigger the description
  dropped is kept in the body's ## Triggers section, so the family hook's words stay advertised
  (test/advertised_check.js in the hub).