chore: consolidate agent harnesses under harnesses/

[thenotoriousllama]

Summary

• Move claude-code, codex, openclaw, and pi plugin trees into harnesses/ and add harnesses/cursor/ and harnesses/hermes/ placeholders.
• Update esbuild, CI/release workflows, installers, hooks, scripts, and vitest config to use the new paths.
• Refresh README, architecture docs, and private knowledge docs so references match the layout.

Test plan

• npm test (or project vitest suite) passes locally
• CI workflow paths resolve for claude-code and openclaw bundles
• npm run install targets for codex, openclaw, pi, and hermes still find harness sources
• Release workflow still packages harness artifacts from harnesses/*

[github-actions]

Coverage Report

Scope: files changed in this PR. Enforced threshold: 90% per metric (per file via vitest.config.ts).

Status	Category	Percentage	Covered / Total
🔴	Lines	86.40% (🎯 90%)	1150 / 1331
🔴	Statements	85.18% (🎯 90%)	1339 / 1572
🔴	Functions	89.80% (🎯 90%)	176 / 196
🔴	Branches	81.30% (🎯 90%)	826 / 1016

File Coverage — 22 files changed

File	Stmts	Branches	Functions	Lines
src/cli/embeddings.ts	🔴 49.0%	🔴 50.8%	🔴 75.0%	🔴 48.1%
src/cli/index.ts	🔴 85.3%	🔴 85.0%	🟢 100.0%	🔴 82.5%
src/cli/install-codex.ts	🟢 96.4%	🔴 86.6%	🟢 100.0%	🟢 96.5%
src/cli/install-hermes.ts	🟢 92.1%	🔴 81.5%	🟢 100.0%	🟢 96.5%
src/cli/install-openclaw.ts	🟢 100.0%	🟢 90.9%	🟢 100.0%	🟢 100.0%
src/cli/install-pi.ts	🟢 100.0%	🟢 100.0%	🟢 100.0%	🟢 100.0%
src/cli/skillify-spec.ts	🟢 100.0%	🔴 89.3%	🟢 100.0%	🟢 100.0%
src/cli/util.ts	🟢 95.5%	🟢 92.8%	🟢 100.0%	🟢 98.0%
src/graph/build-lock.ts	🔴 75.0%	🔴 58.3%	🟢 100.0%	🔴 73.7%
src/hooks/cursor/session-end.ts	🟢 96.0%	🔴 85.7%	🟢 100.0%	🟢 94.4%
src/hooks/graph-on-stop.ts	🔴 89.5%	🔴 73.3%	🔴 87.5%	🟢 90.5%
src/hooks/hermes/session-end.ts	🟢 96.2%	🔴 85.0%	🟢 100.0%	🟢 94.7%
src/hooks/hermes/session-start.ts	🟢 98.4%	🟢 92.5%	🔴 83.3%	🟢 100.0%
src/hooks/pi/wiki-worker.ts	🟢 90.8%	🔴 89.7%	🟢 90.0%	🟢 92.6%
src/hooks/session-notifications.ts	🟢 93.8%	🟢 90.0%	🔴 75.0%	🟢 100.0%
src/hooks/shared/context-renderer.ts	🟢 95.1%	🔴 82.0%	🟢 100.0%	🟢 94.9%
src/hooks/shared/skillopt-hook.ts	🟢 100.0%	🟢 100.0%	🟢 100.0%	🟢 100.0%
src/skillify/agent-model.ts	🟢 92.4%	🔴 89.8%	🔴 88.9%	🟢 100.0%
src/skillify/autopull-worker.ts	🔴 0.0%	🟢 100.0%	🔴 0.0%	🔴 0.0%
src/skillify/gate-runner.ts	🟢 92.8%	🔴 76.0%	🟢 100.0%	🟢 96.3%
src/skillify/skill-invocations.ts	🟢 95.8%	🔴 87.1%	🟢 100.0%	🟢 100.0%
src/skillify/skillopt-worker.ts	🔴 0.0%	🔴 0.0%	🔴 0.0%	🔴 0.0%

_{Generated for commit 6c1ef5a.}