Integrate Kimaki 0.13 cleanup

[chubes4]

Summary

• replace wp-coding-agents Kimaki shims with Kimaki 0.13 native skill filtering, cwd dispatch, and agent fallback
• narrow dm-agent-sync and dm-context-filter to Data Machine-owned concerns
• register only truthful runtime attribution env vars and remove stale Kimaki signature blocks
• keep upgrade-time cleanup for legacy helpers, adapters, and skill kill-list behavior

Verification

• bash tests/bridge-render.sh
• bash tests/post-upgrade-restore.sh
• bash tests/runtime-signature.sh
• bash tests/cli-channel-perms.sh
• bash tests/kimaki-agent-fallback.sh
• bash tests/opencode-local-plugin-path.sh
• bash tests/repair-opencode-json.sh
• bash tests/path-helpers.sh
• bash tests/opencode-wrapper-removal.sh
• bash tests/homeboy-components.sh
• node tests/effective-prompt/run.mjs

Issues

• Fixes Refresh dm-context-filter for Kimaki 0.13 prompt and managed startup flags #143
• Fixes Remove Kimaki agent-normalization compensation after 0.13 fallback #145
• Fixes Remove Kimaki bundled-skill deletion now that 0.13 supports skill filters #146
• Fixes Rework or remove dm-agent-sync OpenCode plugin #147
• Fixes Retire datamachine-kimaki-session in favor of native kimaki send --cwd #148
• Fixes Fix or remove stale Kimaki runtime-signature env-var registrations #149

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafted and integrated the Kimaki 0.13 cleanup changes, resolved merge conflicts, and ran regression tests. Chris remains responsible for review and merge.