Merge main into the Phase 17 refactor

`main` changed the four files this branch split into packages, so all four
came back as modify/delete conflicts. Each change is ported to the module
that now holds the code, unchanged in behavior:

- `delete_action` moves to `routers/adventures/actions.py`. It reaches the
  turn lock as `turns.acquire_turn_lock` and `turns._active_turns`, which is
  the rule this branch set: the package root no longer re-exports the names a
  test rebinds.
- `EMIT_RULE` moves to `worldstate/parse.py`, and `_describe_stat` and
  `render_reference` to `worldstate/render.py`.
- The chip-wrap rules move to `styles/schema-editor.css`, and
  `StateChangeChips` to `pages/Play/reports.jsx`. `index.css` keeps this
  branch's import list.

`test_delete_state.py` needed four edits to run here. It drops the eight-line
database prologue, because `conftest.py` does that once now. It imports the
shared `ScriptedProvider` from `fakes.py` instead of carrying a copy. It
patches `adventures.turns.OpenAICompatibleProvider` and reaches the lock the
same way. And it no longer passes `index=0` when it builds the start action,
because migration 71 drops that column.

564 tests pass. `npm run lint` and `npm run build` are clean, and the CSS
bundle is 56.71 kB, which is the pre-merge size plus main's new rules.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/src/pages/Play/reports.jsx

@@ -53,9 +53,10 @@ function StateChangeChips({ changes }) {
         // neither an update nor a refusal, and "+0" read as the former.
         const blocked = c.clamped && d === 0
         const dir = blocked ? 'refused' : typeof d === 'number' ? (d > 0 ? 'up' : d < 0 ? 'down' : 'flat') : 'flat'
+        const signed = !blocked && typeof d === 'number'
         const txt = blocked
           ? 'no change — at its limit'
-          : typeof d === 'number' ? (d > 0 ? `+${d}` : `${d}`) : `→ ${c.value}`
+          : signed ? (d > 0 ? `+${d}` : `${d}`) : `→ ${c.value}`
         const title = blocked
           ? c.fix || 'The story asked to change this and it is already at the limit the scenario allows.'
           : c.clamped
@@ -63,7 +64,7 @@ function StateChangeChips({ changes }) {
             : undefined
         return (
           <span key={i} className={`chg chg-stat chg-${dir}`} title={title}>
-            {nice(c.label)} <span className="chg-val">{txt}</span>
+            {nice(c.label)} <span className={signed ? 'chg-val chg-num' : 'chg-val'}>{txt}</span>
             {c.clamped && !blocked ? <span className="chg-limited"> (limited)</span> : null}
           </span>
         )