Make workspace bootstrap failures non-blocking and feed errors to agent

[localagent-box]

Summary

• Non-blocking bootstrap by default (workspace-bootstrap.ts): a failed setup/verify command no longer throws and blocks the agent start. The failure is recorded on the agent's bootstrap record (status: 'failed' with the command, exit code, output tail, and error) and the run continues.
• setup.failOnError inverted to default false: the previous throw-on-failure behavior is now the explicit escape hatch — setting setup.failOnError: true still fails the whole agent start. verifyCommand failures follow the same semantics (recorded+non-blocking by default, fail-hard with failOnError: true; previously verify had no opt-out).
• Error fed to the agent (opencode/runner.ts): formatBootstrapSummaryBlock now renders a ## Workspace bootstrap failed (host) block — failing command, exit code, error, and output tail — instructing the agent to diagnose and repair the environment as part of the task (without touching .localagent-box/ config). Wired into batch/interactive kickoff (session-orchestrator.ts) and the loop INITIAL_PLAN kickoff (loop-run-flow.ts). Skipped-bootstrap prompt behavior is unchanged.
• Docs (docs/repo-config.md): setup.failOnError documented as default-false (record + agent fix attempt) vs true (fail-hard); setup script and verifyCommand sections updated; post-setup summary section now covers both the ready and failed blocks.

Test plan

• Updated workspace-bootstrap.test.ts: failing setup.sh is recorded and non-blocking by default; throws only when environment.json sets failOnError: true; failing setup.command records status: 'failed', the error message, and output tail, and logs "continuing (the agent will attempt to fix it)".
• Updated workspace-setup.test.ts to match the new non-blocking/verify semantics.
• New formatBootstrapSummaryBlock failure-block tests in runner.test.ts covering the failed-bootstrap prompt block and skipped-state passthrough.
• npx tsc --noEmit clean; full suite green (136 tests, 0 failures).

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Created from a Local Agent Box session.

Branch: bootstrap-failures
Base: main
Commit: 2a9b1f9
Session: 98d7dc39b353
Model: glm-5.3-flash:cloud