Add 10 high-value missing tests across DSL v2, temporal, uncertainty, and plugin contracts

[Copilot]

The issue requested a targeted review of the suite and addition of the highest-value missing tests in DSL v2, temporal behavior, uncertainty handling, and plugins, without adding markdown docs.
This PR adds 10 focused regression/contract tests in existing test modules to close high-risk gaps around error contracts, algebra semantics, temporal edge cases, and UQ/provenance behavior.

• DSL v2: error and algebra contracts

  • Added coverage for parameter-binding error quality (ParameterMissingError includes provided parameter context).
  • Added post-execution algebra tests for multilayer result union:
    • ambiguous identity strategy path,
    • mixed deterministic/UQ conflict path,
    • explicit conflict resolution success path.

• Temporal DSL and temporal utilities

  • Added execution-time guard coverage for unsupported window aggregation modes.
  • Added AST-level coverage for negative timestamp temporal windows.
  • Added partial-interval edge-case coverage in temporal extraction (t_start + invalid t_end => unbounded end).

• Uncertainty: defaults and edge-case payloads

  • Added test validating metric-level uncertainty method/sample settings override global defaults.
  • Added edge-case test ensuring small-network UQ outputs remain structured (mean/std/method/sample metadata present).

• Plugins: registry and temporal contract behavior

  • Added test ensuring validation-failing plugins remain discoverable in registry listings but are not retrievable.
  • Added plugin contract test for temporal network input rejection path (graceful domain error).

• Provenance replay + uncertainty

  • Added replay coverage for UQ-computed metrics to ensure payload/schema and UQ config metadata are preserved across replay.

Example of the new high-value contract coverage:

r1 = Q.nodes().compute("degree").execute(net)
r2 = Q.nodes().compute("degree", uncertainty=True, method="bootstrap", n_samples=5).execute(net)

r1.meta["identity_strategy"] = "by_replica"
r2.meta["identity_strategy"] = "by_replica"

with pytest.raises(AttributeConflictError):
    _ = r1 | r2

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