Go-Standalone spawn hardening: never park the window on a failed spawn (#781)

[aarontrowbridge]

Closes #781.

What

The Go-Standalone flow no longer parks the window on a failed spawn: the fleet attach poll stops only after the local server reports healthy; a failed spawn restores polling and re-offers with per-window backoff (30s base, 5-min ceiling, resets on successful attach); the known duplicate column name local-DB crash signature is surfaced with its actual cause and a journal self-heal remediation behind an explicit confirmation (never auto-run).

Gates (director-run)

• pnpm --filter amicode test: 2209 passed / 29 skipped / 0 failed (full suite, own run)
• tsc --noEmit -p packages/extension: clean

Notes

• Smoke (test:smoke) fails identically on the pristine baseline in a fresh worktree (no vendored binary; and a pre-existing smoke-script 401 auth mismatch) — pre-existing, out of scope.
• Part of the 2026-09-03 handoff bundle (C of E); provenance: vault sessions/session-20260903-fleet-improvements-brainstorm.md §6.

[coderabbitai]

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