Adds a write-capable create_entry tool to the MCP server, enabling
Claude (Opus/Sonnet/Haiku) to save health insights directly into a
dossier instead of losing them in chat.
Tool: create_entry
- Required: dossier (16-char hex), category (e.g. 'supplement',
'nutrition', 'tracker'), value (short label)
- Optional: type, summary, data (JSON), parent, timestamp (default: now)
- RBAC-enforced via EntryWrite — only writable dossiers accepted
- Category validated against CategoryFromString; unknown categories
return a helpful error listing valid options
- data field validated as JSON before write
Use cases:
- Claude analyzing supplements: 'Create a supplement entry for Vitamin D3
5000 IU with notes on dosing rationale'
- Nutrition logs from a meal conversation
- Tracker observations or AI-generated insights with provenance
The MCP server was previously read-only (all tools had readOnlyHint).
create_entry intentionally omits readOnlyHint as it mutates state.
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