docs: reconcile BACKLOG against shipped work + gitignore tui preview binary

Backlog hygiene per the file's own maintenance rule — resolved items get
moved out, not left ticked-in-place.

- Cut resolved body bullets from BACKLOG §A/B/C/D/E/G/I (health probes,
  static-first infra, CritiqueFinding, architect contradiction-check, A1/A2
  gates, batch fetch-approval, source/egress events, render matrix, markdown,
  session list, idea promotion, turnId/probe/narration, .cs symbols, scene
  validator). All already archived in RETRO's burndown table.
- Narrow partially-done items to their live follow-up rather than delete:
  B5 -> static_check stage emitter only; B6/C-A3 -> CritiqueOutcomeCorrelated
  producer only; C-A1 -> planner-prompt activation only.
- Drop the stale "§E UNBLOCKED" index line (plan-comparison is BLOCKED, no
  PlanCandidate event; idea-promotion shipped f107ff5).
- Archive the operator-requested TUI wave (palette, @ picker, CLAUDE.md L0
  injection, inline action rows, free-scroll/help/filter) in RETRO 2026-06-22
  — never BACKLOG items, would otherwise be orphaned in neither file.
- gitignore apps/tui-go/preview (cmd/preview build artifact).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

RETRO.md

@@ -7,6 +7,42 @@ could not be run here.
 
 ---
 
+## 2026-06-22 — BACKLOG hygiene reconcile + operator-requested TUI wave (branch `feat/backlog-burndown`)
+
+**Hygiene reconcile.** Per `BACKLOG.md`'s own maintenance rule, cut the resolved body bullets
+that were left ticked-but-in-place after the 2026-06-20 burndown and 2026-06-21 grants work.
+Sections affected: §A (health probes), §B (static-first infra, `CritiqueFinding`, architect
+contradiction-check), §C (A1/A2 gate code), §D (batch fetch-approval, source events, dynamic
+egress), §E (render matrix, markdown, session list, idea promotion), §G (turnId/probe/narration),
+§I (`.cs` symbols, scene validator). Partially-done items were **narrowed to their live
+follow-up** rather than deleted: §B5 → "static_check stage emitter only", §B6/§C-A3 → "the
+`CritiqueOutcomeCorrelatedEvent` producer only", §C-A1 → "planner-prompt activation only". The
+full commit map stays in the BACKLOG "✅ RESOLVED" index; detail is in the tables below.
+
+**Operator-requested TUI wave (archived here — never BACKLOG items, like the grants work).**
+A run of TUI/UX features added on the branch after the burndown, each compiled + `go vet`/`go
+test` green and rendered via `cmd/preview` before commit:
+
+| Commit | What |
+|--------|------|
+| `9143d55` | Global input history + stop idle redraws (copy-safe — no redraw churn while selecting text). |
+| `85bfddf` | Slash-command menu in the chat input. |
+| `2662156` | Transparent modal backdrops (overlays no longer paint an opaque box over the transcript). |
+| `ba7ac06` | Transcript message-jump (`^↑`/`^↓` to your prev/next message) + OSC52 clipboard copy. |
+| `65e5d88` | **Server:** `ListFiles`/`FileList` protocol backing the TUI `@` picker. |
+| `04d7e26` | `@` file-reference picker in the input. |
+| `c616982` | **Context:** inject `CLAUDE.md` / `AGENTS.md` as L0 standing context. |
+| `54f94a5` | Command-palette keybinds + configurable (hideable) status bar. |
+| `6a06f2e` | Inline action rows in the OUTPUT transcript (tool results / approvals / writes / grants as `RouterEntry` role `action`, interleaved by arrival). |
+| `f14a83c` | Drop the inline tool-*start* rows (they doubled up with the result rows). |
+| `531910d` | Transcript free-scroll (`PgUp/PgDn`, `^u/^d`, `esc` snaps to tail-follow; clamped via `outputViewport()`/`buildTranscriptRows`, 2 tests) + help overlay (`?`) + event-inspector `/` filter. |
+
+These are mostly deterministic render/UX changes (verifiable by `go test` + `cmd/preview`); the
+only remaining live look is the §E approval-ergonomics re-audit noted in BACKLOG (the band gained
+the grant scope-picker + action rows since `d5afcd3`).
+
+---
+
 ## 2026-06-21 — wider grants + revoke (branch `feat/backlog-burndown`)
 
 Operator-requested (not a prior BACKLOG item): grants that outlive a single session, plus a