feat(core): publish invocation obstruction graph facts

[flyingrobots]

Adds causal graph fact publication for optic invocation obstruction.\n\nDoctrine:\nRegistered handles are not authority.\nInvocation obstruction is causal refusal evidence.\nObstruction facts are not admission tickets, law witnesses, executions, scheduler output, or counterfactual candidates.\nReceipts explain graph outcomes; they do not replace graph facts.\n\nBehavior:\n- unknown handle publishes GraphFact::OpticInvocationObstructed\n- operation mismatch publishes GraphFact::OpticInvocationObstructed\n- missing capability publishes GraphFact::OpticInvocationObstructed\n- basis and aperture request bytes are named by deterministic digests\n- fact digests remain deterministic\n\nScope:\n- no success admission\n- no AdmissionTicket\n- no LawWitness\n- no grant validation\n- no execution\n- no scheduler\n- no persistence\n- no Continuum schema\n\nVerification:\n- cargo test -p warp-core --test optic_invocation_admission_tests\n- cargo test -p warp-core --test causal_fact_publication_tests\n- cargo check -p warp-core\n- scripts/ban-nondeterminism.sh\n- npx markdownlint-cli2 docs/design/invocation-obstruction-graph-facts.md CHANGELOG.md\n- git diff --check

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Reviewing files that changed from the base of the PR and between 31c77c1 and 49d635e.

📒 Files selected for processing (6)

• CHANGELOG.md
• crates/warp-core/src/causal_facts.rs
• crates/warp-core/src/lib.rs
• crates/warp-core/src/optic_artifact.rs
• crates/warp-core/tests/optic_invocation_admission_tests.rs
• docs/design/invocation-obstruction-graph-facts.md

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• Create PR with unit tests
• Commit unit tests in branch stack/invocation-obstruction-graph-facts

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