chore(openspec): drop 9 superseded proposals + 11 stub archive files

Drop 9 batch proposals that are superseded by the boocode-lift-analysis
(boocontext-audit, conductor upgrades, self-healing/verify-gate skills):
add-3tier-memory, import-llm-evaluator, import-pregel-engine, plugin-platform,
conductor-evolution, code-intelligence-upgrade, dev-workflow, ui-overhaul,
agent-reliability.

Delete 11 stub archive files (49-66B each, 'Status: Shipped. Archived.' only)
that provide zero documentation value over the existing CHANGELOG.md + git tags.

openspec/changes/enhanced-file-panel/proposal.md

@@ -0,0 +1,46 @@
+# Enhanced file panel — diff display modes, inline comments, and in-browser file editing
+
+## Why
+
+BooCode's right-rail file panel has a solid foundation: a file tree (read-only), a Git diff tab
+with unified display and stage/commit/discard. But it lacks features users expect from a modern
+code review surface:
+
+1. **Side-by-side diff** — was deferred under YAGNI in v1. The current unified-only view is hard
+   to read on wide files and wastes horizontal space on desktop.
+2. **Hide whitespace** — meaningless whitespace changes clutter diffs in code-generation workflows.
+3. **Wrap long lines** — unified diffs of long lines require horizontal scrolling.
+4. **Expand/collapse all** — only per-file expand exists; bulk toggling is missing.
+5. **Inline diff comments** — was explicitly out-of-scope in v1. The user cannot annotate diffs.
+6. **In-browser file editing** — the file tree is read-only. Editing requires agent tool calls or terminal.
+
+## What Changes
+
+### Frontend
+
+- **GitDiffView.tsx** — toolbar row with: Unified/Split toggle, Hide whitespace toggle, Wrap lines
+  toggle, Expand/Collapse all, Refresh (existing)
+- **Diff rendering** — split-layout renderer (two panels side-by-side, aligned line numbers),
+  CSS `pre-wrap` for wrapped lines
+- **Inline comments** — `InlineReviewGutterCell` (hover → + button), `InlineReviewThread`,
+  `InlineReviewEditor` (textarea saved via Zustand store)
+- **Comment storage** — Zustand store persisted to localStorage, keyed by diff context
+- **File editing** — double-click file in tree → inline textarea → Save/Cancel → server write API
+- **Preferences hook** — `useDiffPreferences` → `{ layout, wrapLines, hideWhitespace }`
+
+### Server
+
+- **`git_diff.ts`** — add `ignoreWhitespace` param, pass `-w` to `git diff`
+- **New route** — `POST /api/projects/:id/write_file` with pathGuard security
+
+### Infrastructure
+
+- No DB changes — comments client-side, file writes to disk
+- No new WS frames — uses existing `git_diff_refresh` event
+- No `@boocode/contracts` changes
+
+## Risk
+
+- **Side-by-side diff rendering** — biggest rendering risk; Paseo's `diff-layout.ts` is the reference
+- **Inline comments** — lost on localStorage clear; acceptable for v1
+- **File editing** — last-writer-wins for single-user is acceptable