Support OpenCode V2 alongside V1

[moritzWa]

Summary

• Preserve V1 and add explicitly selected V2 service authentication, catalogs, transcripts, controls, restart/continuation, and root-TUI attach.
• Require advertised exact-client targeting for cross-directory selection and speech pause, with no V2 broadcast fallback.
• Preserve V2/mixed SQLite history, hierarchy, and incremental FTS through read-only compatibility views.
• Add private frozen-snapshot handoff import/adoption into a new V2 ownership map. Explicitly selected continuations use stable per-root input IDs journaled before admission and reconciled on retry/restart.
• Reject stale metadata/watermarks, pending forms/permissions, completed roots, unsettled tools, and uncertain outcomes before handoff continuation. Preserve adopted title/summary/model/location/creation time and managed controls.
• Repair baseline CI blockers tracked in Restore the failing baseline CI checks #32 (Restore the failing baseline CI checks): Rust 1.75 process probes, exact visible README inventory, percentage usage forecasts, count-free PTY assertions, and the asynchronous Claude model-probe fixture race.
• Document exact manifest schema, CLI invocation, isolated configuration, and evidence in docs/opencode-v2-parity.md.

Verification

• COMPLETE locked local macOS suites PASS on Rust 1.75.0 and stable, without test-name filters or exclusions: 712 library, 21 CLI, 5 README, 24 PTY tests, and all remaining enabled integration/doc targets. Existing opt-in provider/benchmark ignores are unchanged.
• Canonical Rust 1.75 formatting and all-target Clippy with warnings denied PASS. Debug build and isolated installer/package fixtures PASS.
• Assertions retain exact inventories/rows, pagination bounds, responsiveness thresholds, and terminal restoration. No tests or hooks were disabled to make the branch green.
• Actual unified V2 handoff test passes: existing imported IDs, public CLI adoption/resume, managed Reply and successful Interrupt, forms/permissions and late-form rejection, private-file/endpoint/model checks, immutable repeated manifest, and source title/summary/creation-time preservation.
• Lost-ACK proof restores the exact pre-POST journal after real admission, then restarts while the provider stream is active. Reconciliation retains exactly one continuation input ID; restart sends no anonymous duplicate. Admission deduplication is not an exactly-once tool claim.
• Two real TUI PTYs pass source and compiled-candidate targeting: bidirectional exact-client cross-directory route/location/title/OSC changes, non-target unchanged. Harmless speech.pause fixture proves targeted dispatch; actual audio acceptance remains manager-owned.
• Stock compiled V2 lifecycle passes, including discovery/FTS, registration authentication, PID renewal, stop/relaunch, reconnect, and verified shutdown.
• All 20 remote checks PASS on head 4a94f81: canonical quality/MSRV/stable suites, native Linux x86/ARM, macOS ARM/Intel, Windows compilation/runtime/startup/package checks, and OpenCode move regressions. Both push and pull-request runs completed successfully.

Integration review

Do not merge until the migration manager reviews integration. No install or shared-server restart performed; worktree retained. Manager owns final frozen snapshot, outcome reconciliation, quiescent cutover, and real read-aloud/audio VM acceptance. Docker V2 discovery and unmanaged stock explicit-model foreground launch remain documented boundaries.