Promote develop to main: re-sync (no file changes yet) - #666

PRD-880 landed its `#gamepad` convention row in a `[skip ci]` squash, and that row is
mandatory ('a convention missing from the templates' convention index does not exist').
It costs 35 rendered words in every kit, and six kits were over: starter 1,234, minimal and
action-rpg 1,231, collectathon 1,227, platformer 1,211, shooter 1,208. Four of them sat
within four words of 1,200 before the row, so the correct statement of the defect is that
the constant had no headroom, not that the convention is too long.

1,250 is the widest kit plus one median convention row (14.6 words), measured by the
checker itself: `instruction-budget.spec.ts` 9 of 9, `template.spec.ts` 58 of 58, all 16
templates inside budget. The row itself is untouched, so no stated override or marker was
traded away for a word count.

PRD-880 added `gamepad` and `gamepad-idle` to the kit, so `countPlaytestFiles` reads 21
and the spec's pin of 19 failed with 'platformer scenario count changed; update the Charter
with the tree'. The prose follows the executable, as the rule asks.

PRD-880 put a 0.2 radial dead zone, rescaled so full tilt is still 1, in front of every
standard pad. The injected pad's [0.5, -0.25] has magnitude 0.559, so the move axis reads
0.401 / 0.201 rather than the raw 0.5 / 0.25 the spec pinned.

The spec deleted nothing on restore when `navigator` had no own descriptor: it assigned
`globalThis.navigator = undefined`, which throws 'Cannot assign to read only property' on a
host that has a getter-only navigator (the CI runner did, this host did not). Delete the own
property the test defined instead, which reveals whatever the host had underneath.

The overlay replaces `src/render` in the capture copy, so it must export what the template's
own `postprocessing.ts` imports. PRD-871 added `tierShadows` to the template's `quality.ts`
and not to the overlay, and `unreal-look-baseline-scaffold.spec.ts` caught it as one
unresolved import: 'render/postprocessing.ts: tierShadows from ./quality.js'.

PRD-880 authored 'gamepad', 'controller', 'joypad', 'xbox', '8bitdo' and 'steam deck' on
`InputMap` and the spec's predecessor map never learned them: 59 authored aliases against
53 named rows.

One request row carries every vendor word, and the four the situations already spell
(controller, joypad, xbox, steam deck) are marked `baselineAlreadyRecalled`, the flag the
file already uses for the PRD-865 rows. Measured, not assumed: search without the aliases
returns nothing for 'add gamepad support' and drops `InputMap` for '8bitdo pad maps the
wrong button', so the two that earn recall keep it.

`budget.json` is rewritten from the measurement (`caps:recall --update-budget`): 113 to 114
rows, recallAtK 0.938596 (107/114), zeroResultRate 0.043860.

PRD-871's dispose path reached the engine hook through `as unknown as
IEngineRateRig`. The quality gate treats a new `as unknown as` without a
baseline entry as fatal, so `pnpm quality` — and with it the `budgets` job —
reds on the promotion candidate (run 43158306254, attempt 2).

`trackAnimationRate` already reaches the same optional hook through
`Partial<IEngineRateRig>` and a `typeof` guard; the dispose path now does
exactly that, which drops the cast and keeps a malformed rig from throwing
on dispose instead of silently skipping the call.

Verified: pnpm quality (equality gate clean, finding gone), pnpm typecheck,
pnpm exec biome check on the file, and the 184 tests in
render-camera-cull/animation/game specs.