feat: check formatting, linting and tests in CI

Every push runs ruff, prettier, pytest and svelte-check; a tagged release runs the
blocking half again before it publishes an image. eslint and svelte-check report
without failing, since 87 and 30 findings predate the workflow.

TODO.md

@@ -114,15 +114,15 @@ CMD ["litestar", "--app-dir", "chitai", "run", "--host", "0.0.0.0", "--port", "8
 `litestar run` is the CLI development runner. Production should invoke uvicorn or granian
 directly, with a worker count.
 
-### Nothing gates formatting, linting or types
+### No type checker on the backend
 
-`ruff format --check src/` reports 27 of 61 files unformatted, and `ruff check src/` finds
-114 errors — 100 of them unused imports, the rest bare `except`, unused variables and
-`== True` comparisons. `ruff check --fix` clears 51 automatically.
+Formatting, linting and tests now run in CI (`.gitea/workflows/ci.yml`) and block, and the
+tree is clean against them. What is still missing is a type checker: nothing runs one despite
+`# type: ignore` comments in the tree.
 
-There is no `[tool.ruff]` section in `pyproject.toml`, so only ruff's default `E4/E7/E9/F`
-rules run, and no type checker is configured at all despite `# type: ignore` comments in
-the tree. Individually these are trivial; collectively they say nothing runs on commit.
+`pyproject.toml` gained a `[tool.ruff.lint.per-file-ignores]` section for `__init__.py`
+re-exports, but no rule selection — so only ruff's default `E4/E7/E9/F` rules run. Widening
+that set is worthwhile and will surface a fresh batch of findings.
 
 ## Frontend