Release v0.19.2: Vim editing in question answers - #90

Summary

Prepares the v0.19.2 patch release from current main. It ships #86 and #89.

• Custom question answers get Vim editing on OpenCode v1 and v2 (vimcode doesn't work in question tool prompts #78). Pasting into an answer waits for queued motions.
• Moves [Unreleased] into ## [0.19.2] — 2026-10-13 and updates the compare links.
• Bumps package.json and VERSION to 0.19.2.
• Updates the v2 pins and release wording in README, CONTRIBUTING and the v2 POC notes. The recommended v1 pin stays at v0.18.1.

Validation

• CI on fix: enable Vim editing in question answers #86 passed check, harness integration and E2E v1/v2 on top of test: add Terminal Control PR guards #89.
• No 0.19.1 refs remain outside the changelog history. The VERSION/package.json sync test covers the bump.
• Local just check could not run: bun install can't reach the npm registry from this machine. CI on this PR is the check.

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