feat(agents): W2/S1 plugin split — probe (sonnet) + advisor reasoner (opus) + plugin-gate include (BDR-077)

plugin-advisor keeps its name, becomes the opus REASONER: PHASE 1 bash
extracted to new plugin-probe (sonnet, facts-only PROBE REPORT), PHASE 4
apply + checkpoint hoisted to new lib/plugin-gate.md (main-loop include,
doc-commit.md x6 pattern). Fail-closed: advisor ERRORs on missing report.
4 consumers rewired (plugin-check, onboard, init-project, ship-feature).
In-wave planted-input smoke PASSED: probe report complete w/ fallbacks;
advisor consumed every planted field (monorepo per-package note, fast-libs
ctx7 reco) with zero re-detection; ERROR verdict on absent report.
Census §13 (81 pass). Note: new subagent_type registers next session —
resolution re-check before wave merge.

skills/ship-feature/SKILL.md

@@ -20,7 +20,8 @@ $ARGUMENTS
 ---
 
 ## STEP 0 — PLUGIN CHECK + AUTO-ACTIVATE
-Load `$HOME/.claude/agents/plugin-advisor.md`. Feed request.
+Run `$HOME/.claude/lib/plugin-gate.md`. Feed request (dispatch plugin-probe →
+checkpoint → dispatch plugin-advisor; gates stay in this loop — BDR-077).
 - ACTION REQUIRED → show RECOMMENDATIONS block, offer: A) fix plugins B) type "force". STOP.
 - PROPOSED CHANGES exist → show list, ask "Apply? (yes / no / customize)". Apply on confirm.
 - OK → `✅ Plugin check passed — [active plugins] — complexity: <score>%`, continue.