chore: remove old handoff docs, plans, review reports, and task lists from rootHEADmaindev

Removed 40+ markdown files that were cluttering the repo root:
- frontend-*-handoff.md (28 files) — historical API contract handoffs, features all implemented
- backend-to-fe-handoff.md, backend-to-fe-handoff-2.md — old handoff docs
- broken-chat-repair-handoff.md — old repair handoff
- PLAN-mcp.md, PLAN-per-edit-diagnostics.md — old planning docs
- ai-review-report.md, crash-review-report.md — one-time review reports
- tasks.md, HANDOFF.md — outdated status docs (git log is the source of truth)

Kept: AGENTS.md, GLOSSARY.md, ORCHESTRATOR.md, README.md
Also: gitignored ai-review-report.md so future Gemini reviews don't commit it

1 files changed, 0 insertions, 100 deletions

diff --git a/frontend-conversation-list-handoff.md b/frontend-conversation-list-handoff.md
deleted file mode 100644
index dd3fd63..0000000
--- a/frontend-conversation-list-handoff.md
+++ /dev/null
@@ -1,100 +0,0 @@
-# FE handoff — conversation list, title, and open tab
-
-Courier this to `../frontend`. All changes are ADDITIVE — nothing existing breaks.
-
-## What shipped (backend)
-
-Three new features for conversation management:
-
-1. **Conversation list** — `GET /conversations` returns all known conversations with
-   metadata (id, title, createdAt, lastActivityAt). The backend auto-tracks metadata
-   on every message append; title defaults to the first user message (truncated 80 chars).
-
-2. **Conversation title** — `GET/PUT /conversations/:id/title` lets the FE read and
-   set a human-readable title for any conversation.
-
-3. **Open tab signal** — `POST /conversations/:id/open` broadcasts a `conversation.open`
-   WS message to all connected clients (e.g. when the CLI uses `--open`). See also
-   `frontend-conversation-open-handoff.md` for the WS message details.
-
-No version bumps needed — all types are already in `@dispatch/transport-contract` `0.13.0`
-and `@dispatch/wire` `0.9.0`.
-
-## `GET /conversations` — conversation list
-
-Returns all conversations sorted by `lastActivityAt` descending (most recent first).
-
-- Optional `?q=<prefix>` query param filters by conversation ID prefix (short-ID
-  resolution — used by the CLI; the FE can ignore it or use it for search).
-- 200 response: `ConversationListResponse`
-
-```ts
-interface ConversationListResponse {
-  readonly conversations: readonly ConversationMeta[];
-}
-
-interface ConversationMeta {
-  readonly id: string;
-  readonly createdAt: number;      // epoch-ms
-  readonly lastActivityAt: number;  // epoch-ms
-  readonly title: string;
-}
-```
-
-**FE use case:** render a conversation sidebar/picker showing title + relative time.
-Click a conversation to open it (load its history via the existing `GET /conversations/:id`).
-
-## `GET /conversations/:id/title` — read title
-
-- 200 response: `TitleResponse { conversationId, title }`
-
-## `PUT /conversations/:id/title` — set title
-
-- Body: `SetTitleRequest { title: string }` (non-empty after trim, else 400)
-- 200 response: `TitleResponse { conversationId, title }`
-
-**FE use case:** let the user rename a conversation. The title is also auto-set from
-the first user message, so a newly created conversation already has a title.
-
-## `GET /conversations/:id/last` — blocking last message
-
-Blocks server-side until any in-flight turn settles, then returns the last AI text
-message. Mainly for CLI use (`dispatch read <id>`), but the FE could use it for
-notifications or previews.
-
-- 200 response: `LastMessageResponse { conversationId, content, turnId? }`
-- `content` is empty string if the conversation has no assistant message.
-- Unknown conversation → `content: ""` (200, not an error).
-
-## `POST /conversations/:id/open` — signal frontend
-
-Calls the backend to broadcast `conversation.open` to all connected WS clients. See
-`frontend-conversation-open-handoff.md` for the WS message format and FE handling.
-
-- 200 response: `OpenConversationResponse { conversationId }`
-
-## What the FE needs to do
-
-1. **Bump pinned deps:** `@dispatch/wire` → `0.9.0`, `@dispatch/transport-contract`
-   → `0.13.0`.
-
-2. **Conversation sidebar/picker:** call `GET /conversations` on load (and periodically
-   or on focus) to show a list of conversations. Each entry shows `title` + relative
-   time from `lastActivityAt`. Click to open → load history via `GET /conversations/:id`.
-
-3. **Title editing:** add an inline edit affordance on the conversation title.
-   `PUT /conversations/:id/title` with `{ title }` to update.
-
-4. **Handle `conversation.open` WS message:** when a `"conversation.open"` message
-   arrives, open (or focus) a tab for that `conversationId`. See
-   `frontend-conversation-open-handoff.md`.
-
-## Notes
-
-- Conversations are **in-memory only** on the backend — the list resets on server
-  restart. New conversations appear as users chat; old ones may disappear after a
-  restart.
-- The title is auto-set from the first user message (truncated 80 chars). Users can
-  override it via `PUT /conversations/:id/title`.
-- `createdAt` is set on the first message append; `lastActivityAt` updates on every
-  append.