The CI gate failed in several non-overlapping ways once the full coding-agent suite ran here: tests wrote into the real $HOME (`/srv/agent-home`) which is read-only, a fixture rotated stored Anthropic API keys but Settings reloaded the user models.yml and shadowed them, an OAuth callback server bound to `hostname:"localhost"` (loopback unreachable in this runtime), a built-in tool metadata assertion only saw `github` when `gh` was installed, and the GithubTool `pr_checkout` worktree assertions assumed `~/.omp/wt` but `XDG_DATA_HOME` redirected `getWorktreesDir()` to `$XDG_DATA_HOME/omp/wt`.
Fixes:
- `packages/ai/src/registry/oauth/callback-server.ts`: drop `hostname: "localhost"` when no caller-supplied hostname overrides it. Bun on Linux refused inbound connections to the listener when bound explicitly to `localhost`; defaulting to Bun.serves default binding restores loopback connectivity.
- `packages/coding-agent/test/status-line-path.test.ts`: route the `~/Projects` fixtures through a writable temp home (spy `os.homedir()`), housed under the repo `.wt/` worktree scratch so the temp home is not classified as a status-line scratch root.
- `packages/coding-agent/test/skills.test.ts`: ditto for the `~/.pi-skills-test-*` mkdtemp in the tilde-expansion test.
- `packages/coding-agent/test/marketplace/project-scope.test.ts`: stop writing `~/.git`; build the entire home-dir guard fixture in a temp dir and spy `os.homedir()`.
- `packages/coding-agent/test/oauth-flow.test.ts`: wrap each callback fetch in a brief retry so the simulated browser redirect tolerates the few-ms gap before the Bun callback server starts accepting connections.
- `packages/coding-agent/test/tools/gh.test.ts`: extend `setupTempHome()` to clear `XDG_DATA_HOME`/`XDG_STATE_HOME`/`XDG_CACHE_HOME` for the duration of the test so the rebuilt dirs resolver routes `getWorktreesDir()` back through the spied home, then restore them on cleanup.
- `packages/coding-agent/test/tool-discovery/initial-tools.test.ts`: instantiate `GithubTool` directly in the metadata fixture so the assertion runs even when `gh` is unavailable (GithubTool.createIf returns null without `gh`).
- `packages/coding-agent/test/agent-session-retry-cap.test.ts`: pass an isolated `models.yml` path to `ModelRegistry` so the two-Anthropic-key fixture is the authoritative credential source instead of any user-level command-backed Anthropic key.
Verification:
- `bun check` → passed
- `bun run test` (full coding-agent suite, 4 buckets, all chunks) → 0 fails
Fixes#3639
roboomp
a98dc285a3