fix(infra): OMN-9154 import DEFAULT_INTROSPECTION_TOPIC from model SoT

[jonahgabriel]

Summary

Ticket: OMN-9154 — replace DEFAULT_INTROSPECTION_TOPIC hardcoded literal in cli/infra_test/introspect.py with import from the canonical source.

The original hardcoded literal was removed in a prior PR (OMN-7226), but the CLI still held its own copy of DEFAULT_INTROSPECTION_TOPIC derived from the generated EnumPlatformTopic. This PR:

• Imports DEFAULT_INTROSPECTION_TOPIC directly from omnibase_infra.models.discovery.model_introspection_config (the canonical model-level default that resolves to SUFFIX_NODE_INTROSPECTION), removing the CLI-layer duplicate.
• Adds two unit tests under TestDefaultIntrospectionTopicSoT that guard against drift:
  • CLI default is the same object as the model default.
  • Both resolve to SUFFIX_NODE_INTROSPECTION.

Acceptance criteria

• Literal removed (already done in OMN-7226; this PR also removes the CLI-layer enum copy).
• Import path from SoT module (model_introspection_config.DEFAULT_INTROSPECTION_TOPIC).
• Unit test verifies default value matches canonical source (TestDefaultIntrospectionTopicSoT).

Scope note

The envvar="ONEX_INTROSPECTION_TOPIC" operator-override knob on line 104 is intentionally left in place. The allowlist-vs-ban decision for *_TOPIC envvars is the responsibility of OMN-9151 child #1 (validator) and is out of scope here.

dod_evidence

• tests/unit/cli/infra_test/test_introspect.py::TestDefaultIntrospectionTopicSoT (2 tests, both PASS)
• Full unit suite for tests/unit/cli tests/unit/mixins/test_mixin_node_introspection.py tests/unit/models/discovery: 418 PASS
• pre-commit run on changed files: PASS (including Topic Naming Lint, AI-slop check, topic drift check)

Test plan

• uv run pytest tests/unit/cli/infra_test/test_introspect.py -v — 18/18 PASS
• uv run pytest tests/unit/cli tests/unit/mixins/test_mixin_node_introspection.py tests/unit/models/discovery -v — 418/418 PASS
• uv run ruff format && uv run ruff check — clean
• pre-commit run --files ... — all hooks passed
• CI green on PR

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📥 Commits

Reviewing files that changed from the base of the PR and between 51cc548 and 7145737.

📒 Files selected for processing (2)

• src/omnibase_infra/cli/infra_test/introspect.py
• tests/unit/cli/infra_test/test_introspect.py

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jonah/omn-9154

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