docs: add CHANGELOG.md for v2.1.4 release

Author: goodguy1963

CHANGELOG.md

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+# Changelog
+
+## [2.1.4] - 2026-05-05
+
+### Added
+
+- **Threaded comment modal** — Full-screen comment preview now includes up/down navigation, a position indicator ("3 / 8"), and an inline reply composer that stays synced with the side editor draft.
+- **Review defaults recommendations** — The Settings tab tracks current vs. recommended review prompt templates separately, with a status pill and "Use recommended" button for each prompt field.
+- **Read-only archived state** — Archived todos show a disabled composer and a clear read-only indicator in both the side editor and the full-screen modal.
+- **Cockpit board modal sync** — After a reply is posted from the modal, the board refresh moves the modal to the latest comment automatically.
+- **Shared comment draft** — The editor and modal reply composer share the same draft value, so switching between views or navigating comments preserves unsaved input.
+
+### Changed
+
+- **Approval modes** — `ApprovalBootstrapMode` expanded to include `"default"`, `"auto-approve"`, and `"autopilot"`. Native chat permissions now map directly to VS Code configuration.
+- **GitHub integration** — Experimental notice added to the GitHub integration tab in the webview.
+- **ESLint guard** — Disabled `@typescript-eslint/no-unused-vars` across test suites to reduce noise on test helpers.
+
+### Fixed
+
+- **Comment modal architecture** — The modal now opens by `(todoId, commentIndex)` instead of a raw comment object, enabling stable navigation and future-proof thread support.
+- **Draft persistence** — Navigating between comments in the modal no longer clears the reply draft.
+- **Source-shape tests** — Updated `cockpitWebview.test.ts` expectations to match the new threaded modal helpers and shared submit flow.
+
+### Removed
+
+- **Safe-staging workflow** — Removed the experimental `safe-staging.yml` GitHub Actions workflow.