Refactor/dag architecture

[stephenc222]

Refactors away from trees to more flexible DAGs.

[codecov]

Codecov Report

❌ Patch coverage is 77.60067% with 267 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
intent_kit/core/traversal.py	65.06%	31 Missing and 20 partials ⚠️
intent_kit/evals/run_node_eval.py	33.33%	46 Missing and 2 partials ⚠️
intent_kit/nodes/classifier.py	42.85%	39 Missing and 5 partials ⚠️
intent_kit/evals/run_all_evals.py	68.47%	28 Missing and 1 partial ⚠️
intent_kit/evals/test_eval_api.py	73.17%	19 Missing and 3 partials ⚠️
intent_kit/core/context/protocols.py	39.28%	0 Missing and 17 partials ⚠️
intent_kit/nodes/extractor.py	85.47%	7 Missing and 10 partials ⚠️
intent_kit/core/dag.py	89.14%	8 Missing and 6 partials ⚠️
intent_kit/core/context/default.py	86.30%	7 Missing and 3 partials ⚠️
intent_kit/nodes/action.py	78.57%	4 Missing and 2 partials ⚠️
... and 7 more

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