fix: break governance↔tracing circular import on cold CLI start

[Prateeks16]

Problem

Cold python -c "import agentwatch.cli.main" (and python -m agentwatch.cli.main --help) fails:

ImportError: cannot import name 'TraceCollector' from partially initialized module
'agentwatch.tracing.collector' (most likely due to a circular import)

Chain: cli/__init__ → cli/demo → tracing/collector → governance/hipaa → governance/__init__ → compliance_reporter → tracing.collector (still mid-import). It only worked under pytest because an earlier test imports agentwatch.governance first, masking the cycle — so the published CLI entrypoint was broken from a cold interpreter.

Fix

governance/compliance_reporter.py uses TraceCollector only as a type annotation and already has from __future__ import annotations, so the runtime import is unnecessary. Moved it under TYPE_CHECKING. One-line-class change, no behavior difference.

Verification

python -c "import agentwatch.cli.main"          # now succeeds cold
python -m agentwatch.cli.main --help            # works
pytest tests/                                    # 491 passed, no new failures

The 10 test_cli_* failures that remain on main (duplicate session_app routing + a result.stderr test bug) are pre-existing and out of scope here — fixed separately in #444 (#405). They'll clear once either lands.

[Copilot]

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[github-actions]

🧪 PR Test Results

Check	Result
Tests (pytest tests/)	❌ failure
Lint (ruff check .)	✅ success
Coverage (agentwatch)	72.70%

_{Python 3.12 · commit 17e62e6}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 5007fb1e-0a40-4e64-a439-d43a51d3e714

📥 Commits

Reviewing files that changed from the base of the PR and between e3012c5 and 17e62e6.

📒 Files selected for processing (1)

• agentwatch/governance/compliance_reporter.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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