Agents can now pin a default writing style. When an AI-actor runs
`create_draft` without an explicit styleId, the tool resolves to the
agent's `defaultWritingStyleId` so e.g. a "Marketing-Agent" always
drafts in the Corporate-Tone style and a "Memoir-Agent" in Memoir.
- @mana/shared-ai: optional `defaultWritingStyleId?: string` added to
the Agent interface (plaintext FK, format `preset:<id>` or a custom
WritingStyle uuid). No migration — existing rows stay undefined and
the fallback path no-ops for them.
- ai-agents store: field threaded through CreateAgentInput + AgentPatch
+ the create function's copy-list. `updateAgent` already deep-clones
the patch so nothing else to change there.
- ai-agents ListView: new "Writing" section in the agent detail panel
with a StylePicker (reuses the writing module's component — Vorlagen
+ Meine Stile optgroups). Empty = kein Default.
- writing/tools.ts: `resolveAgentDefaultStyle()` reads the current
actor, guards `isAiActor`, loads the agent row, and returns its
defaultWritingStyleId. Wired into `create_draft` as a fallback when
`params.styleId` is missing. User-invoked calls skip the lookup — a
human omitting styleId means "ad-hoc, no style", not "my default".
`generate_draft_content` needs no change because the draft's styleId
is already set at create time.
107 shared-ai tests still pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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