fix: make automatic insertion reliable in real editable fields

[douglasjarquin]

Closes #77

Summary

• Captures the destination before microphone permission and keeps a bounded, equality-backed target handoff with capability/settable editability checks and secure-field vetoes.
• Preserves clipboard-first behavior and distinguishes dispatched, verified, copied, secure-rejected, and failed outcomes with stable content-free reason codes.
• Makes History Paste Again race-free across destination handoff, cancellation/timeout, durable outcome recording, focus restoration, interruption, and concurrent dictation.
• Adds deterministic strict-fake coverage for identity collisions, optional identity, editability, secure fields, capture ordering, dispatch acknowledgement, clipboard retention, retries, and no false success.

Verification

• Final head: 3b137c4a3e3ed530d32759ea04241d27f0cde836.
• Base: origin/main 8d97c08777803f3e03840d42982fdfbcd5a72d7c.
• swift build and swift build --product Oigo pass.
• All contract/performance harnesses in .github/workflows/verify.yml pass.
• Release build and release issue [V1 Phase 0 · P0] Make automatic insertion reliable in real editable fields #77 harness pass.
• Native permissioned app-bundle Accessibility/microphone and keyboard-layout evidence are INCONCLUSIVE because the required surface is unavailable in this isolated worktree; no permissions, TCC, Input Monitoring, shared defaults, daemons, or global-event state were changed.

The branch is pushed without force and this PR is intentionally not merged.