docs(phase9): plan corrections from critical review

Pre-execution review against the actual codebase (Codex unavailable
this session) surfaced three mismatches: kon-llm uses LlmEngine with a
synchronous generate(prompt, config), AppState exposes llm_engine as a
direct Arc not behind RwLock, and llmTags persistence requires a real
SQLite migration plus Tauri command extension because saveHistory()
is a no-op stub today (which also means manualTags edits weren't
persisting). Plan now adds Task 8.5 for migration v14 + storage and
Tauri-command extension. Spec data-model section corrected to match.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/superpowers/specs/2026-04-24-phase9-polish-debt-design.md

@@ -96,7 +96,7 @@ A new utility `src/lib/utils/saveMarkdown.ts` centralises `suggestedFilename` +
 
 ### Item 3 — LLM content tags
 
-**Data model.** Add `llmTags: string[]` to history entries alongside `manualTags`. Persisted via the existing `saveHistory` path; columnar storage already serialises arrays as comma-joined strings (see `page.svelte.ts:290`).
+**Data model.** Add `llmTags: string[]` to history entries alongside `manualTags`. Persisted via a real SQLite column `transcripts.llm_tags TEXT NOT NULL DEFAULT ''` added in migration v14, exposed through an extended `update_transcript` Tauri command. (Earlier draft of this spec assumed the existing `saveHistory()` path was a real persist; closer review showed it's a no-op stub. The migration + command extension is in-scope as Task 8.5 of the plan, and additionally fixes a latent bug whereby existing `manualTags` edits weren't persisting either.)
 
 **Tag schema.**
 - `topic:<1-3 noun phrase>` — free-form, lowercase, hyphen-joined. Examples: `topic:interview-prep`, `topic:grant-application`, `topic:personal-finance`. Limit one per transcript (the dominant subject).