SOU-70: client-side context redaction

[tsouth89]

Summary

• Add scrub_context / dangerous_context_keys mirroring backend _CONTEXT_DENYLIST (case-insensitive; also drop _bw* keys)
• Auto-scrub context in BurnwatchClient.record() before buffering so secrets never leave the process
• Export helpers from the package root; unit + integration tests

Closes #2
Closes Linear SOU-70

Test plan

• Local: pytest -q — 26 passed
• CI green on PR
• CodeRabbit review addressed before merge

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 37e04f10-c27c-43fd-bb5b-062cd6ef53e9

📥 Commits

Reviewing files that changed from the base of the PR and between 3ae43e7 and 9fe9411.

📒 Files selected for processing (2)

• burnwatch/redact.py
• tests/test_redact.py

📝 Walkthrough

Walkthrough

Adds client-side context redaction using a case-insensitive denylist and _bw prefix filtering. BurnwatchClient.record() now scrubs context before buffering and omits empty results. The redaction helpers are exported at package level. Tests cover dangerous keys, empty results, nested dictionaries, sorted key detection, and client buffering integration.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the main change: client-side context redaction in Burnwatch.
Description check	✅ Passed	The description is directly related to the PR and accurately summarizes the added redaction, exports, and tests.

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ℹ️ Review info

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Run ID: 34c5581f-5cf1-4bbf-868d-243e8f693148

📥 Commits

Reviewing files that changed from the base of the PR and between 1ded675 and 3ae43e7.

📒 Files selected for processing (4)

• burnwatch/__init__.py
• burnwatch/client.py
• burnwatch/redact.py
• tests/test_redact.py

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