Major changes:
- Add execute_recipe task that uses S-expression planner
- Recipe S-expression unfolds into plan S-expression with code-addressed cache IDs
- Cache IDs computed from Merkle tree of plan structure (before execution)
- Add ipfs_client.add_string() for storing S-expression plans
- Update run_service.create_run() to use execute_recipe when recipe_sexp available
- Add _sexp_to_steps() to parse S-expression plans for UI visualization
- Plan endpoint now returns both sexp content and parsed steps
The code-addressed hashing means each plan step's cache_id is:
sha3_256({node_type, config, sorted(input_cache_ids)})
This creates deterministic "buckets" for computation results computed
entirely from the plan structure, enabling automatic cache reuse.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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