feat(extensions): give panes the current line's source address

[benvinegar]

Summary

Opted-in pane currentLine already follows the cursor, but only as an opaque row painter (render(side, width)). Commands already get { side, line } on ctx.selection.currentLine. Panes did not, so anything that needs the address — blame, diagnostics, notes — could not update as the user stepped.

This adds side and line to ExtensionCurrentLinePaint (API v14). Same opt-in (currentLine: true), same public address as command selection and revealLine. Lens keeps calling .render(); a blame pane can read the address.

Test plan

• bun test src/ui/lib/extensionCurrentLine.test.ts src/ui/lib/extensionPanes.test.ts src/ui/hooks/useExtensionPaneController.test.tsx src/extensions/runExtension.test.ts
• oxlint on changed files
• Load hunk-lens (hunk extension install modem-dev/hunk-lens) and confirm the bottom lens still follows the current line
• Throwaway pane with currentLine: true that notifys ${currentLine.side}:${currentLine.line} on each step

[vercel]

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Project	Deployment	Actions	Updated (UTC)
hunk-web	Ready	Preview	Aug 31, 2026 12:40am

[greptile-apps]

Greptile Summary

This PR advances the extension API to v14 and exposes the current cursor’s { side, line } source address to panes that opt into current-line paint.

• Adds immutable source-address fields to ExtensionCurrentLinePaint.
• Populates the fields from the same live cursor target used by command selection.
• Updates focused tests, package validation, release metadata, and extension documentation.

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness, compatibility, or security issues identified.

The pane fields are derived from the same live cursor target used for command selection, publication is guarded by matching cursor identity, and the API version, exports, package check, tests, and documentation remain aligned.

Important Files Changed

Filename	Overview
src/extension-api/types.ts	Advances the public API to v14 and documents the additive current-line source-address fields.
src/ui/lib/extensionCurrentLine.tsx	Publishes the active cursor target alongside the existing frozen row painter.
src/ui/lib/extensionCurrentLine.test.ts	Verifies the painter exposes the cursor’s side and line while preserving existing rendering behavior.
scripts/check-pack.ts	Extends the package-consumer type check to exercise the newly published fields.
docs/extensions.md	Documents API v14 and the pane current-line address contract.

_{Reviews (1): Last reviewed commit: "feat(extensions): give panes the current..." | Re-trigger Greptile}