feat(vue,journeys): downstream feedback — plugin-typed manifests, runtime.discard, template-idiomatic host outlet

[kibertoad]

A second consumer feedback round (Vue + Nuxt), triaged critically: some items
were already solved and only needed verification/docs; the rest are focused,
backward-compatible changes.

• installModularApp (@modular-vue/nuxt) and createModularApp (@modular-vue/runtime)
  no longer erase plugin-extension types. They inferred over ModuleRegistry<…, any>
  and returned ApplicationManifest<TSlots, TNavItem>, collapsing manifest.journeys
  to unknown and forcing a cast. They now infer the extension map from the
  registry's resolve() return (the plugin tuple hides behind PluginRuntimesOf and
  isn't invertible; the extensions ride plainly on ApplicationManifest's third
  arg), so a journeysPlugin() registry yields manifest.journeys: JourneyRuntime
  with no cast. Plugin-less callers unaffected.

• New JourneyRuntime.discard(id, reason?): end(force) + forget in one call, so a
  Cancel button drops the persisted blob without re-deriving keyFor(input). Names
  the "throw it away" intent — the counterpart to a soft close that keeps the blob
  by not ending the instance. Runs onAbandon and forces the outcome terminal.

• slot outlet is now a stable functional component (was a raw
  VNode), so the documented <component :is="outlet" /> actually renders and
  patches — not remounts — across steps. Slot also exposes runtime, enabling the
  idiomatic <JourneyOutlet :instance-id :runtime /> alternative.

• Verified (no code change): inline buildInput entries authored directly inside
  defineModule (no defineEntry wrapper) now flow buildInput presence into
  typeof mod, so StepSpec.input goes optional — the behavior a consumer flagged
  to re-check post-feat(journeys,core): fix defineModule + derive step ordering/progress (feedback items 3 & 4) #83. Locked in with regression tests.

• Docs + nuxt-modal-journey example: close-vs-cancel contract with runtime.discard
  recipe, functional-component outlet, appProvides auto-threading (provideJourney-
  Runtime unnecessary in the plugin path), and the defineNuxtPlugin TS7022
  annotation footgun. Example gains a "Cancel (discard)" button + e2e case.

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01TuYsjBFX8hKizbY5Yep1Bm

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📥 Commits

Reviewing files that changed from the base of the PR and between 57c782c and d1ea3f3.

📒 Files selected for processing (20)

• CHANGELOG.md
• docs/framework-mode-nuxt.md
• docs/journeys-vue.md
• examples/vue/nuxt-modal-journey/README.md
• examples/vue/nuxt-modal-journey/shell/app/components/SetupWizardModal.vue
• examples/vue/nuxt-modal-journey/shell/app/composables/useWizardControls.ts
• examples/vue/nuxt-modal-journey/shell/e2e/smoke.spec.ts
• packages/frontend-core/src/journey-contracts.ts
• packages/frontend-core/src/step-spec.test-d.ts
• packages/journeys-engine/src/persistence.test.ts
• packages/journeys-engine/src/runtime.ts
• packages/journeys/README.md
• packages/vue-journeys/README.md
• packages/vue-journeys/src/journey-host.test.ts
• packages/vue-journeys/src/journey-host.ts
• packages/vue-nuxt/README.md
• packages/vue-nuxt/src/install.test-d.ts
• packages/vue-nuxt/src/install.ts
• packages/vue-runtime/src/app.ts
• packages/vue-runtime/src/index.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/library-feedback-types-plugins-0x1eti

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