chore(release): 0.13.0 — parallel batch rendering

[jbrecht]

Lockstep minor release. Bumps tutorial-forge and tutorial-forge-cli to 0.13.0.

Highlights

• Parallel batch rendering (Cross-tutorial render parallelism for batch regeneration #62) — opt-in --render-concurrency <n> (default 1). Measured 1.95× on a 2-job batch, output byte-identical. Requires a parallel-safe adapter (documented).
• --phase record without a prior tts phase (render --phase record can't run without a prior tts phase, breaking the cheap TTS-free authoring check #50) — the TTS-free --contact-sheet framing check now works on a fresh work dir.
• Broader recap-framing lint (Recap lint heuristic too narrow: misses valid past-tense / accomplishment-style recaps #49) — no longer false-warns on accomplishment-style recaps.
• Job-collision backstop (workDir/output collision when a tutorial id equals another id + lang suffix #65) — defense-in-depth for render path collisions (the slug rule already prevents them).

New exports: mapLimit, silentTTSResult, loadTTSResultIfPresent. New CLI flag + renderConcurrency config.

Why minor

Additive exports + new flag/config; no breaking signature changes.

Quality

All three reviewers (code/perf/qa) passed on #62 + #65; three real concurrency bugs were caught and fixed pre-merge. CLI now has a vitest harness and CI runs pnpm -r test. core 183 + cli 10 tests pass.

Publish (after merge)

git checkout main && git pull && pnpm install && pnpm build
pnpm --filter tutorial-forge publish        # core FIRST
pnpm --filter tutorial-forge-cli publish
git tag v0.13.0 && git push origin v0.13.0

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