feat(course): audit fixes and twelve extensions (Modules 7b, 12, 13)

Audit pass:
- Frame rule counts frames since the last move, so every step lasts
  exactly movesEvery(score) frames, also right after a speed-up
- clampTime + MAX_GAP_MS: a hidden tab no longer replays the whole gap
- Pong Restart keeps held keys
- Fact corrections (mulberry32 output coverage, Haskell IO, uniform)
- New fixture cases from a mutation analysis

Extensions (all three tracks, shared fixtures, course text):
- Turn queue (Exercise 10.6), persisted high score (10.7),
  replay viewer (10.8), play() end-to-end helper (9.5)
- Optional State (4.7) and optional Module 7b, stack-safe IO
- Module 12, property-based testing with generators, shrinking,
  invariants and a model-based oracle
- Module 13, Conway's Life with a Click event
- JS type checking via jsconfig, JSDoc and types.d.ts
- Maintainer tools: scripts/mutate.mjs, scripts/typecheck-js.sh,
  Playwright end-to-end suite (e2e/, scripts/e2e.sh)

Docs: docs/contract.md is the canonical contract; specs and build log
under docs/superpowers.

Verified: JS 728, Scala 689, F# 691 unit tests; stubs and progression
M01-M13 and M07b; 176 end-to-end tests on Chromium and WebKit.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

fsharp/test.sh

@@ -1,11 +1,13 @@
 #!/usr/bin/env bash
-# Usage: ./test.sh [MNN]   (no arg = all tests)
+# Usage: ./test.sh [MNN]   (no arg = all tests; e.g. ./test.sh M04, ./test.sh M07b)
+# Every test list is named "MNN Name" (tag, a space, a name). Expecto's --filter-test-list matches a substring, so the
+# tag is passed with its trailing space: "M07 " selects "M07 IO" but not "M07b SafeIO".
 set -euo pipefail
 cd "$(dirname "$0")"
 export PATH="$HOME/.dotnet:$PATH"
 export DOTNET_NOLOGO=1 DOTNET_CLI_TELEMETRY_OPTOUT=1
 if [ $# -ge 1 ]; then
-  exec dotnet run --project tests -- --filter-test-list "$1"
+  exec dotnet run --project tests -- --filter-test-list "$1 "
 else
   exec dotnet run --project tests
 fi