Add meta/agent-roles/ named CMUX worker roles

[casey-capshaw-rbrk]

Summary

• New meta/agent-roles/ — one system-prompt fragment per KB-native worker role (research, compile, lint, initiative-worker), mapped onto this kit's own raw→compile→index→lint verbs and initiative-delegation model rather than a generic app-build split.
• Plain markdown files, not an auto-discovered agent-type config path — keeps them from registering as available agent types in every session and avoids resting on an untested assumption about the MCP-fleet-bloat problem already documented for native in-process subagents.
• meta/AGENTS.md § Optional extensions: notes the role-file convention and that launch steps can be wrapped behind a custom slash command/macro if your agent CLI supports one — described as guidance, not shipped as a literal command file (deliberately, since command-config directories are elsewhere excluded from this kit's copy conventions).
• Both CMUX Jobs/ runbooks' launch steps updated to --append-system-prompt the matching role file (absolute path, since a worker's cwd may not be the vault root).

Test plan

• Kit's own meta/bin/lint.sh green
• Grepped for leaked personal identifiers — clean (only pre-existing hit is an untouched CI workflow file)
• Read full diff before committing

[claude]

VERDICT: PASS

Reviewed the diff (a8e7fb0..0895615, "Add meta/agent-roles/ named CMUX worker roles + AGENTS.md guidance").

Privacy: clean. New files (meta/agent-roles/{research,compile,lint,initiative-worker}.md) and the edits to the two CMUX Jobs/ runbooks + meta/AGENTS.md use only generic placeholders (<model-id>, <vault>, <slug>, <label>) — no real names, hosts, paths, or credentials.

Schema consistency: meta/agent-roles/ sits inside the already-structural meta/ folder, so it doesnt touch the root-inbox check, and lint.sh only scans concepts/Initiatives/Jobs/People/index.md — these new role files (their own role/model/mcp/sentinel frontmatter, not concept frontmatter) dont trip the frontmatter check. References to the new folder use backtick paths, not [[wikilinks]], so meta/link-map.md needs no regen. Sentinel formats line up between the role files and the two Jobs runbooks that launch them (e.g. "DONE: | ..." in initiative-worker.md matches the kickoff brief in "Delegate an initiative to a CMUX workspace.md"; "DONE: research- | ..." matches the pane example in "Spawn subagent panes in a CMUX workspace.md").

Doc coherence: meta/AGENTS.md section Optional extensions documents the new folder consistently with the Related sections added to both Jobs files. Minor, non-blocking note: like the pre-existing meta/optional/automation/ bundle, this new folder isnt called out in CLAUDE.mds folder table or setup.md — not introduced by this PR, just a pre-existing gap worth a follow-up pass if those docs get updated.