perf(exec): serial disposition for articulation_points (#563)

[DecisionNerd]

Implements #563: serial disposition for articulation_points.

Closes #563

  

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Note

Enforce serial disposition for ArticulationPoints analyzer across thread configurations

• The ArticulationPoints analyzer runs serially due to ordered DFS state, bypassing Rayon's global thread pool regardless of the configured compute thread count.
• Adds a test in algorithm_analyze.rs that asserts identical output schema and fingerprint across 1, 2, 4, and 8 compute thread configurations.
• Documents the serial execution policy in execution-resource-policy.md, including cancellation/resource limit behavior.

^{Macroscope summarized 4b4db88. (Automatic summaries will resume when PR exits draft mode or review begins).}

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