Extension sessions stage SKILL.md only — companion files dead-link; plus three skill-text fixes

[aarontrowbridge]

Important

Problem — (1) stageOpencodeSkills (packages/extension/src/scores/package_skills.ts) copies only SKILL.md into the per-session stage dir, but 16 shipped skills carry companion files (tdd's five craft docs, debugging's two, teach's four, nine references/ dirs, …). Every relative link in the staged copy dead-ends in extension sessions, even though skillGrants already grants the agent the ENTIRE source skill dir — the content is permitted but not present. (2) Three smaller text rots from the 2026-08-16 audit: improve-codebase-architecture says "use the Agent tool with subagent_type=Explore" (Claude-ism; on opencode the dispatch tool is Task); amico-slack's link-format example points at a PR in the retired amico-plugin repo; amico-lab's device-lock instruction says "create ~/.amico/ops/locks/devices/{name}.lock" without creating the parent dir (absent on a fresh machine).
Approach — (1) Stage the whole resolved skill dir (fs.cpSync recursive). No guard change: the stage dir still holds ONLY the resolved set — the only-resolved-set test assertion stays true — and companions were already readable via grants, so nothing new is exposed. Extend the stageOpencodeSkills test to pin companion staging. (2) Engine-neutral dispatch wording; live-repo example URL; mkdir -p in the lock instruction.

Acceptance Criteria

• A skill with companion files stages them: <stageRoot>/<name>/<companion> exists after stageOpencodeSkills, and only resolved skills' dirs appear at the stage root
• The existing suite stays green (vitest run --exclude '**/slow/**' in packages/extension) and tsc --noEmit passes
• improve-codebase-architecture names no engine-specific tool as the only path (engine-neutral wording)
• amico-slack's example link points at a live harmoniqs repo
• amico-lab's lock instruction creates the parent directory

Testing Decisions

Extend the existing stageOpencodeSkills describe block in test/scores/package_skills.test.ts (reuse-first).

Source

Audit session 2026-08-16; armonissima-side remediation in armonissima#54/#55.

Notes

Companions affected: tdd (5), debugging (2), grill-with-docs (2), teach (4), improve-codebase-architecture (3), brainstorming (1), references/ dirs in atoms, bosonic, demo, harmony, pasqal, problem-types, qec-autoresearch, setup, solve.