phase: 91_admin_theme_tab

All verification is complete — this pass needed no code changes. Final report:

**Phase 91 — Admin Theme tab: final verification pass (all 6 tasks already in `complete/`)**

- Verified pre-paint theming end-to-end: `ui_settings` store + resolver, admin `GET/PUT /api/ui-settings`, `CachingMiddleware` inline-`<style id="bor-theme">` injection before `</head>` (incl. `/shared/<token>` prefix branch, unit-pinned), CSP sha256 exemption for the inline tag, Theme tab shell + `theme.js` editor, CSS-file theming fully retired.
- No defects found; zero changes made — working tree left exactly as the task executors left it.
- Tests: `uv run pytest --cov=app` → 1841 passed, 0 failed (TOTAL coverage **99%**; theming/ui_settings/caching all 100%); `uv run pytest tests/e2e/test_admin_theme_tab.py -v --no-cov` → **5 passed** in isolation.
- Lint/types: `uv run ruff check .` → All checks passed; `uv run pyright` → 0 errors, 0 warnings.
- Criteria: (1) unset deployment byte-identical, no `#bor-theme` anywhere — ✓ (unit no-op test + E2E reset byte-compare); `rg "BOR_THEME|themes/"` → single hit is the permitted doc-history comment in `frontend/index.html`. (2) admin-only gate + 403s for anonymous and token users — ✓ (E2E test 3). (3) saved theme inline before `</head>` on every page incl. `/shared/<token>`, computed `--brand` on first paint for admin + anonymous — ✓ (E2E test 2 + unit). (4) reset → byte-identical; 5 contrast pairs warn <4.5:1, non-blocking — ✓ (E2E tests 4–5). (5) suite green, >90% coverage, lint clean — ✓. (6) commit deferred to harness per rules.
- Notable: `.agents/PLAN.md` is absent from the repo — the phase overview's Design section was used as the binding spec; no deviation resulted.
- Next pending phase: **none** — 91 is the last phase in `todo/`.

tests/conftest.py

@@ -40,12 +40,13 @@ os.environ["BOR_SUGGESTIONS"] = json.dumps(_Settings.model_fields["suggestions"]
 
 # Phase 62: the same leak class for the new UI customization settings —
 # an operator's local ``.env`` may legitimately carry
-# ``BOR_INPUT_PLACEHOLDER`` / ``BOR_FOOTER_TEXT`` / ``BOR_THEME``, and
-# the default-metadata pins must see the code defaults (derived from
+# ``BOR_INPUT_PLACEHOLDER`` / ``BOR_FOOTER_TEXT``, and the
+# default-metadata pins must see the code defaults (derived from
 # the class fields, same pattern as the suggestions line above).
+# (Phase 91, task 03: the retired CSS-file theme env var no longer
+# exists — nothing to pin.)
 os.environ["BOR_INPUT_PLACEHOLDER"] = _Settings.model_fields["input_placeholder"].default
 os.environ["BOR_FOOTER_TEXT"] = _Settings.model_fields["footer_text"].default
-os.environ["BOR_THEME"] = _Settings.model_fields["theme"].default
 
 from app.db import SessionLocal, db_available  # noqa: E402
 from app.main import app as fastapi_app  # noqa: E402