Scope agent task guidance to available tooling

[chubes4]

Summary

• Replaces README fleet-cooking framing with optional orchestration guidance that keeps Homeboy and Kimaki gated to installs that selected them.
• Tightens the composed Homeboy Codebox AGENTS.md section with an explicit operator-verb boundary for release, deploy, fleet, and ssh.
• Filters Kimaki's generic helper-session spawning hint from managed prompts while preserving Kimaki chat/session command examples.
• Fixes the Homeboy component test harness to source the helper that owns homeboy_project_id.

Fixes #181

Verification

• bash tests/agents-md-guidance.sh
• node tests/effective-prompt/run.mjs --update && node tests/effective-prompt/run.mjs
• set -e; fail=0; while IFS= read -r -d '' f; do if ! bash -n "$f"; then echo "FAIL: $f"; fail=1; fi; done < <(find . -type f -name '*.sh' -not -path './.git/*' -print0); exit "$fail"
• ./tests/bridge-render.sh
• ./tests/opencode-wrapper-removal.sh
• ./tests/kimaki-agent-fallback.sh
• node tests/setup-profile-compiler.mjs
• node tests/dm-agent-sync.mjs
• ./tests/runtime-signature.sh
• ./tests/homeboy-components.sh
• ./tests/post-upgrade-restore.sh
• bash tests/repair-opencode-json.sh

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (gpt-5.5)
• Used for: Drafted the guidance/filter/test changes and ran local verification. Chris remains responsible for review and testing.