fix(types): close 26 svelte-check errors via SubAgent type drift (#214 PR2) (#226)

Second of the cleanups proposed in #214 (Group A). Purely additive
field updates — no behavior changes. Brings `npm run check` from
53 -> 27 errors (closes 26).

## What was wrong

`SubAgentForm.svelte` reads and writes nine fields that the type
contracts never exposed. The reads/writes are correct — the data
round-trips through `settings.json`, the Rust `subagents` table (20
columns, all present in `subagents.rs` and `subagent_writer.rs`), and
Tauri — but `$lib/types` and `markdownParser` had drifted, so the
errors piled up silently.

## Changes

- `subagent.ts` — add `disallowedTools`, `maxTurns`, `memory`,
  `background`, `effort`, `isolation`, `hooks`, `mcpServers`,
  `initialPrompt` to both `SubAgent` (read via `Partial<SubAgent>` as
  the form's `initialValues`) and `CreateSubAgentRequest` (the object
  the form's `handleSubmit` builds). Types match the Rust struct:
  string arrays, a numeric `maxTurns`, a boolean `background`, the
  rest strings.
- `markdownParser.ts` — add the seven fields that `applyParsedSubAgent`
  assigns to `ParsedSubAgent` (`hooks`/`mcpServers` excluded — the
  paste/import path doesn't touch them).

## Maps to #214 groups

Closes group **A** (SubAgent / ParsedSubAgent type drift, 26 errors).

The remaining 27 errors fall into #214's groups B, D, E, H, K, M —
targets for follow-up PRs.

## Test plan

- [x] `npm run check` — 27 errors (down from 53 on `main`)
- [x] `npx vitest run` — 1565/1565 tests pass
- [x] Verified zero NEW errors (remaining 27 all pre-existing, map to
      #214's other groups)

Co-authored-by: Tyler Gray <tylerg@emergentsoftware.net>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

src/lib/types/subagent.ts

@@ -8,6 +8,15 @@ export interface SubAgent {
 	permissionMode?: string;
 	skills?: string[];
 	tags?: string[];
+	disallowedTools?: string[];
+	maxTurns?: number;
+	memory?: string;
+	background?: boolean;
+	effort?: string;
+	isolation?: string;
+	hooks?: string;
+	mcpServers?: string;
+	initialPrompt?: string;
 	source: string;
 	sourcePath?: string;
 	isFavorite: boolean;
@@ -24,6 +33,15 @@ export interface CreateSubAgentRequest {
 	permissionMode?: string;
 	skills?: string[];
 	tags?: string[];
+	disallowedTools?: string[];
+	maxTurns?: number;
+	memory?: string;
+	background?: boolean;
+	effort?: string;
+	isolation?: string;
+	hooks?: string;
+	mcpServers?: string;
+	initialPrompt?: string;
 }
 
 export interface ProjectSubAgent {

src/lib/utils/markdownParser.ts

@@ -50,6 +50,13 @@ export interface ParsedSubAgent {
 	permissionMode?: string;
 	skills?: string[];
 	tags?: string[];
+	disallowedTools?: string[];
+	maxTurns?: number;
+	memory?: string;
+	background?: boolean;
+	effort?: string;
+	isolation?: string;
+	initialPrompt?: string;
 }
 
 export interface ParseResult<T> {