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* feat: gate terminal-agent teardown on ServerConfig.ownsTerminalAgent Adds ownsTerminalAgent?: boolean to ServerConfig (default true). Wraps the three shutdown side effects (pkill -f terminal-agent\.ts + 2 safeUnlinkQuiet calls for terminal-port and terminal-internal-token) inside a single if (ownsTerminalAgent) block. Embedders (gbrowser phoenix overlay) pass false to keep their own PTY lifecycle intact across gstack's teardown. CLI start() call site passes ownsTerminalAgent: true explicitly; static-grep test in the new test file catches a refactor that drops it. Strict opt-out: only explicit false flips the gate (cfg.ownsTerminalAgent === false ? false : true). Defends against JS callers passing truthy non-bool values. Adds __resetShuttingDown test-only export mirroring __resetRegistry. The module-scoped isShuttingDown latch otherwise silently no-ops a second shutdown() in the same process. Drops dead try/catch wrappers around safeUnlinkQuiet inside the new gate — safeUnlinkQuiet already swallows all errors internally. New test file (4 cases) stubs both process.exit AND child_process.spawnSync so a real pkill -f terminal-agent\.ts never fires on the developer machine. beforeAll/afterAll save and restore real-daemon file contents in the state dir so the test cannot clobber a running gstack session. * chore: file followup TODOs (identity-based pkill, cfg.config composition gap, ownership-object trigger) Three P3 followups surfaced by /autoplan + /plan-eng-review while reviewing the ownsTerminalAgent gate: - Identity-based terminal-agent kill: pkill -f terminal-agent\.ts is a latent CLI footgun (regex match kills sibling gstack sessions, editor processes, etc.). Replace with PID-tracked process.kill at both cli.ts:1047 and server.ts:1281. - shutdown() reads module-level config, not cfg.config (pre-existing composition gap). Same gap applies to cleanSingletonLocks(resolveChromiumProfile()) at server.ts:1298 (should be cfg.chromiumProfile). Both are followup work for the embedder-composition story. - 4th caller-owned teardown gate trigger: today ServerConfig has 3 (xvfb?, proxyBridge?, ownsTerminalAgent). If a 4th appears, collapse to cfg.callerOwns?: Set<...> ownership object. * chore: bump version and changelog (v1.42.1.0) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * docs: note ServerConfig.ownsTerminalAgent in CLAUDE.md sidebar block Adds a one-paragraph reference for the v1.42.1.0 embedder teardown gate right after the Sidebar architecture block. Covers default semantics, when embedders must pass `false`, polarity inversion vs xvfb?/proxyBridge?, and the static-grep CI test that pins the CLI call site. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>