- Revert to runTurn() — stream() yields token deltas not messages
- Add allowedTools: [island_save] so agent cant use memory or other
built-in tools
- Remove unused SDKMessage import

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Speeds up island:analyze significantly. Override with --model=claude-sonnet-4-20250514 etc.

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Use session.send() + session.stream() instead of runTurn() so the
agent thinking, tool calls, and results are logged to stderr in
real-time as the analysis runs.

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Replace rule-based keyword matching with LLM-powered analysis:
- Agent receives full island context (vertices, edges, domains, contributors)
- Agent calls island_save tool with structured analysis
- Produces real narrative synthesis instead of template strings
- Removes carry dependency — works from discovered component data alone
- Keeps same SQLite schema, CLI flags, and output format

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- Extract shared island utilities (islandId, findComponents, etc.) into island-shared.ts
- All island:* commands now use 12-char lexmin hash as canonical island ID
- Regenerate lexicons/generated/ with org.latha.island namespace
- Fix island:analyze execFileSync import and null guards

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