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- tasks.md, HANDOFF.md — outdated status docs (git log is the source of truth)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, 124 deletions

diff --git a/backend-to-fe-handoff-2.md b/backend-to-fe-handoff-2.md
deleted file mode 100644
index 51a3e34..0000000
--- a/backend-to-fe-handoff-2.md
+++ /dev/null
@@ -1,124 +0,0 @@
-# Backend → FE handoff — context window + percentage-based compact
-
-> Courier to `../frontend`. Response to the context-window ask in
-> `backend-handoff.md` §3 + compacting rework.
-
-## What shipped
-
-1. **`GET /models` now includes `contextWindow` per model** — the FE can replace
-   the hardcoded `MAX_CONTEXT = 1,000,000` with the real value.
-2. **Auto-compact is now percentage-based** (default 85% of `contextWindow`)
-   instead of a flat token count (was 350k).
-
-## Bump pinned deps
-- `@dispatch/wire` → `0.11.0` (unchanged)
-- `@dispatch/transport-contract` → `0.15.0` (unchanged — the new types are
-  additive to the existing version)
-
-## `GET /models` — now includes `modelInfo`
-
-The response now includes an optional `modelInfo` map alongside the existing
-`models` array. The `models` array is unchanged (backward compatible).
-
-```ts
-interface ModelsResponse {
-  readonly models: readonly string[];
-  readonly modelInfo?: Readonly<Record<string, ModelMetadata>>;
-}
-
-interface ModelMetadata {
-  readonly contextWindow?: number;  // max tokens (e.g. 200000)
-}
-```
-
-**Example response:**
-```json
-{
-  "models": ["opencode/deepseek-v4-flash", "umans/umans-glm-5.2"],
-  "modelInfo": {
-    "opencode/deepseek-v4-flash": { "contextWindow": 128000 },
-    "umans/umans-glm-5.2": { "contextWindow": 200000 }
-  }
-}
-```
-
-`modelInfo` is absent when no provider reports `contextWindow`. Each key is the
-same `<credentialName>/<model>` string from the `models` array.
-
-**What the FE should do:**
-- When rendering the composer status bar, use `modelInfo[selectedModel].contextWindow`
-  as the denominator for `contextSize / contextWindow · pct%`.
-- Fall back to the current hardcoded `1,000,000` when `modelInfo` is absent or
-  the selected model has no `contextWindow`.
-
-## Auto-compact: now percentage-based
-
-**Old:** flat token threshold (default 350000). `contextSize >= threshold`.
-**New:** percentage of `contextWindow` (default 85%). `contextSize >= contextWindow × (percent / 100)`.
-
-Also fixed: the check now uses `contextSize` (true context occupancy = last
-step's `inputTokens + outputTokens`) instead of the overcounted aggregate
-`usage.inputTokens` (which summed every step's re-prefilled prompt).
-
-### `GET /conversations/:id/compact-percent` — read percent
-
-200: `CompactPercentResponse { conversationId, percent }`
-- `percent: 0` — auto-compact explicitly disabled (manual only).
-- `percent: null` (not stored) — **default: 85** (85% of the model's context window).
-- Any positive number (1-100) — auto-compact triggers when `contextSize`
-  exceeds `percent`% of the model's `contextWindow`.
-
-### `PUT /conversations/:id/compact-percent` — set percent
-
-Body: `SetCompactPercentRequest { percent: number }`
-- `0` explicitly disables auto-compact.
-- Any positive number (1-100) sets the trigger percentage.
-- Default (when not stored) is 85.
-
-200: `CompactPercentResponse`
-
-**Renamed from `compact-threshold`** — the old endpoint paths, request types,
-and response types are gone. Update any FE code that referenced
-`compact-threshold`.
-
-## New types
-
-```ts
-// @dispatch/transport-contract
-export interface ModelMetadata {
-  readonly contextWindow?: number;
-}
-
-// ModelsResponse now has modelInfo (additive — models array unchanged)
-export interface ModelsResponse {
-  readonly models: readonly string[];
-  readonly modelInfo?: Readonly<Record<string, ModelMetadata>>;
-}
-
-// Renamed from CompactThresholdResponse
-export interface CompactPercentResponse {
-  readonly conversationId: string;
-  readonly percent: number;  // 0 = manual; null = default 85
-}
-
-// Renamed from SetCompactThresholdRequest
-export interface SetCompactPercentRequest {
-  readonly percent: number;
-}
-```
-
-## What the FE needs to do
-
-1. **Use real `contextWindow`** from `GET /models` → `modelInfo[model].contextWindow`
-   instead of hardcoded `MAX_CONTEXT = 1,000,000`.
-
-2. **Rename compact-threshold → compact-percent** in any FE code:
-   - `GET /conversations/:id/compact-percent` (was `compact-threshold`)
-   - `PUT /conversations/:id/compact-percent` (was `compact-threshold`)
-   - `percent` field (was `threshold`)
-
-3. **Settings UI**: change the number input from "token count" to "percent
-   (0-100)". Default 85. 0 = manual only.
-
-4. **No other changes** — the compact endpoint, WS message, and chain
-   architecture are unchanged.