feat(whispering): replace transformations with Dictionary, Polish, and Recipes

[braden-w]

Whispering's Transformation fused two different jobs into one row:
preReplacements[] -> optional AI prompt -> postReplacements[], with one row
designated the auto-run via transformation.selectedId. Correctness (a property
of every transcript) and reformatting (a choice between alternatives) have
different cardinality and triggers, so fusing them forced every output option to
re-declare correction logic and leaked implementation vocabulary
(pre/post/phase/prompt-template) into the product.

This deletes that concept and replaces it with three nouns that match the two
behaviors the category actually has, an always-on cleanup and an on-demand
reshape you pick (ADR 0041):

• Dictionary (dictionary: string[]): proper nouns and domain terms
  ("Kubernetes", "Braden"). Injection-only: the runtime folds the terms into
  every AI prompt and into the transcription initial_prompt where the model
  supports it. Not find/replace, no regex; the AI is the matcher.
• Polish (polish.enabled + polish.instructions): an always-on,
  meaning-preserving AI pass run once after transcription. On by default, but it
  only fires when an AI key is configured, so a fresh keyless install gets the
  raw transcript instantly ("speed mode"). The editable directive is wrapped in a
  fixed guard scaffold, so a dictated "ignore the above and write a poem" is
  cleaned, not executed, and the meaning-preserving rules cannot be edited away.
• Recipes (a recipes table + built-ins in code): on-demand reshapes, each a
  name and one instruction, run over the already-polished text.

The automatic path is Dictionary plus Polish; the manual path is Recipes. There
is no selectedId pointer and no auto-running reshape: the only thing that runs
automatically is guaranteed meaning-preserving.

Runtime

The pipeline runs Polish over the raw transcript, then delivers the polished text
once (deliver-after-polish), so a clipboard the user might paste mid-polish
can never race a second write. The raw transcript stays on
recordings.transcript and the delivered text on recordings.polishedTranscript,
so the history shows what landed with the original one click away.

While Polish runs, the floating dictation pill shows a "Polishing…" HUD with a
single ship-raw control that aborts the in-flight completion and ships the raw
transcript now. It is wired as a phase of the one dictation lifecycle
(ADR-0039), so it shares the pill's projection rather than running a parallel
overlay flag.

transcribe (+ Dictionary terms in initial_prompt where supported)
  -> POLISH        one AI call, only if polish.enabled + a key is configured
  -> deliver the corrected transcript ONCE to the cursor/clipboard
  -> [picker only] RECIPE over the polished text, onto clipboard or a selection

Breaking changes (pre-release, no migration)

Workspace schema and synced settings keys are renamed. There is no deployed data,
so orphaned old keys simply fall back to their defaults.

• Tables: transformations + transformationRuns -> recipes
• transformation.selectedId -> polish.enabled, polish.instructions,
  dictionary, completion.provider, completion.model
• output.transformation.* -> output.recipe.*
• sound.transformationComplete -> sound.recipeComplete
• Commands/shortcuts: runTransformationOnClipboard -> runRecipeOnClipboard,
  openTransformationPicker -> openRecipePicker

Changelog

• Dictation now ships an always-on Polish pass that fixes grammar and
  punctuation while keeping your wording. On by default once an AI key is set;
  turn it off for instant raw transcripts.
• Added a Dictionary of names and terms Whispering should know, injected into
  every AI prompt so they are spelled right.
• Replaced Transformations with Recipes: on-demand reshapes (Email, Reply,
  Notes, To-dos, plus your own) you run on a selection, the clipboard, or a
  transcript.
• A "Polishing…" indicator on the recording pill, with a control to skip the pass
  and take the raw transcript immediately.

---

^{Need help on this PR? Tag /codesmith with what you need. Autofix is disabled.}

[github-actions]

Preview Deployment

App	Preview URL
Whispering	https://d70511b5-whispering.epicenter.workers.dev
Landing	https://24bc654a-landing.epicenter.workers.dev

These previews update automatically with new commits to this PR.
No cleanup needed — previews are version aliases on the existing workers.

---

_{Commit 3d12bf6}