Revert the built-in focused-testing skill (#5877) and the always-on
Repository Setup Preflight brief section (#5886). Both delivered
software-engineering domain content through platform-level prompt
surfaces that every agent receives regardless of workspace type.
- multica-focused-testing was the only built-in skill that did not
describe a Multica platform contract, and the only one without
`user-invocable: false` / `allowed-tools: Bash(multica *)`. Built-in
skills are meta/system skills; a workspace with no repository bound
still carried it in its skill index and slash-command menu.
- Repository Setup Preflight was emitted for every non-quick-create task
without consulting `ctx.Repos`, so non-code workspaces received
build/dependency instructions in the always-on brief. writeRepositories
already elides itself when no repo is bound; this section did not.
Pure revert. No replacement behavior is introduced here.
Co-authored-by: Lambda <lambda@multica.ai>
Co-authored-by: multica-agent <github@multica.ai>
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