docs(tau): reconcile Tau alignment/parity plans with the code

docs/plans/rho-tau-alignment.md

@@ -33,36 +33,39 @@ does the achievable parts:
 Tau's palette is a restrained dark theme: near-black panel, single muted
 accent, generous dim text, no heavy borders.
 
-- [ ] Add a `tau` palette to `internal/theme/theme_palettes.go`
+- [x] Add a `tau` palette to `internal/theme/theme_palettes.go`
       (panel `#0d1117`, ink `#e6edf3`, muted `#8b949e`, accent `#7aa2f7`,
       subtle line `#21262d`).
-- [ ] Register it in `themeRegistry`; make it selectable via `/theme tau`.
-- [ ] Reduce chrome: prefer single-line separators over box borders where the
+- [x] Register it in `themeRegistry`; make it selectable via `/theme tau`.
+- [x] Reduce chrome: prefer single-line separators over box borders where the
       theme is `tau`.
-- [ ] Keep every existing palette intact (no regressions).
+- [x] Keep every existing palette intact (no regressions).
 
 ## Phase 2 — Tau-style layout (visual)
 
 - [ ] Flatten the footer: one status line + one input line (Tau shows a
       minimal bottom bar, not a multi-row panel).
+      NOTE: `renderStatusBar` intentionally renders two rows at width >= 100
+      and `TestRenderStatusBar_TwoLineAtWidth120` asserts it. Flattening is a
+      product/visual decision that needs sign-off before changing that test.
 - [ ] Dim the input border; show the mode as a short prefix rather than a
       separate row.
 - [ ] Tighten the welcome block: wordmark + one hint line.
 - [ ] Preserve all existing information (model, ctx, cost) in the compact row.
 
 ## Phase 3 — Architecture tightening (contract)
 
-- [ ] Document the frontend contract in `docs/architecture/frontend-contract.md`:
+- [x] Document the frontend contract in `docs/architecture/frontend-contract.md`:
       `engine.StreamEvent` is the only channel; TUI/daemon/ACP/print are
       consumers and must not reach into engine internals.
-- [ ] Add a testaudit guard asserting `cmd/` TUI files do not import
+- [x] Add a testaudit guard asserting `cmd/` TUI files do not import
       `internal/engine/*` subpackages beyond the public facade types.
 
 ## Phase 4 — Verification (twice)
 
-- [ ] Pass 1: `gofumpt v0.10.0`, `goimports`, `go build ./...`, `go vet ./...`,
+- [x] Pass 1: `gofumpt v0.10.0`, `goimports`, `go build ./...`, `go vet ./...`,
       `golangci-lint`, targeted tests for touched packages, boundary guards.
-- [ ] Pass 2: independent re-run of the same, plus a fresh-eyes grep for
+- [x] Pass 2: independent re-run of the same, plus a fresh-eyes grep for
       stale references and a manual TUI render check.
 
 ## Out of scope (explicitly)

docs/plans/tau-feature-parity.md

@@ -15,32 +15,32 @@ Tau offers a documented feature Rho does not.
 |---|---|---|
 | Interactive TUI | ✅ Bubble Tea TUI | none |
 | `-p` print mode | ✅ `-p` | none |
-| `--cwd <path>` run against another project | ❌ missing | **add** |
+| `--cwd <path>` run against another project | ✅ `--cwd` | none |
 | Built-in tools (read/write/edit/bash) | ✅ 138 tools (superset) | none |
 | Durable JSONL sessions + resume + branching | ✅ JSONL + DAG branching | none |
-| Slash commands (login, model, sessions, compaction, export, theme) | ⚠️ `/model`, `/compact`, `/export`, `/theme` yes; `/login` no | **add `/login`** |
+| Slash commands (login, model, sessions, compaction, export, theme) | ✅ `/login` added | none |
 | `AGENTS.md` project instructions | ✅ | none |
 | `.tau/` project resources | ✅ `.rho/` | none |
-| `.agents/` shared resources | ⚠️ partial (skills/providers/recipes) | **extend to instructions** |
+| `.agents/` shared resources | ✅ skills/providers/recipes/hooks/rules/workflows + `.agents/AGENTS.md` instructions | none |
 | User skills, prompt templates, themes | ✅ | none |
 | Context accounting + manual/auto compaction | ✅ | none |
-| Provider-neutral output: text, JSON, transcript | ⚠️ text + json + stream-json; no transcript | **add transcript** |
-| `~/.tau/catalog.toml` custom providers/models, no code changes | ❌ missing | **add `~/.rho/catalog.toml`** |
+| Provider-neutral output: text, JSON, transcript | ✅ text + json + stream-json + transcript | none |
+| `~/.tau/catalog.toml` custom providers/models, no code changes | ❌ missing | **flux-side** (see below) |
 | `tau update` | ✅ `rho update` | none |
 | Installers | ✅ `install.sh` | none |
 
 ## Work items
 
-1. **`--cwd` global flag** — change directory before session start; applies to
-   interactive, `-p`, and `exec`.
-2. **`/login` slash command** — Tau's auth entry point; route to Rho's existing
-   credential/config flow (no new secret handling).
-3. **`transcript` output format** — add to `--output-format`; render the turn
-   as a plain, timestamped transcript.
-4. **User catalog `~/.rho/catalog.toml`** — let users add providers/models
-   without code changes, merged over the flux catalog.
-5. **`.agents/` instruction resources** — load `AGENTS.md`-style instructions
-   from `.agents/` in addition to the existing skill/provider/recipe dirs.
+1. ~~**`--cwd` global flag**~~ — done (`cmd/root.go`, applied to interactive, `-p`, and `exec`).
+2. ~~**`/login` slash command**~~ — done (`cmd/chat_subcommand_login.go`).
+3. ~~**`transcript` output format**~~ — done (`--output-format transcript`).
+4. **User catalog `~/.rho/catalog.toml`** — NOT implemented. The model catalog
+   is owned by the flux engine (`github.com/GrayCodeAI/flux/catalog`), whose
+   `LoadCatalogOptions` has no user-catalog override. Per `AGENTS.md`
+   (provider/catalog ownership lives in flux), this must be added in flux and
+   surfaced through the engine facade before rho can consume it.
+5. ~~**`.agents/` instruction resources**~~ — done (`.agents/AGENTS.md` is in
+   the instruction search path in `internal/config/config.go`).
 
 ## Verification (twice)