🧹 [Code Health] Fix Edge Case Detector Unknown Extensions TODO

[theRebelliousNerd]

🎯 What: The code health issue addressed
Addressed the TODO in internal/campaign/edge_case_detector.go:815 where unknown or esoteric file extensions (e.g. .xyz) were being inappropriately appended with Go/TypeScript-specific file split suffixes like _types and _helpers.

💡 Why: How this improves maintainability
If an unknown language is encountered, these hardcoded suffixes create invalid filenames or confusing splits. This commit detects if the language is "unknown", and supplies generic file chunking patterns instead (_part1, _part2, etc). It also adds an assertion and unit test case to ensure proper testing for this scenario.

✅ Verification: How you confirmed the change is safe
A test case TestSuggestSplits_UnknownExtension was successfully executed to ensure unknown languages fallback to generic patterns cleanly. The full test suite was passed with no regressions.

✨ Result: The improvement achieved
A clear mapping for splitting non-supported file types prevents unexpected or incorrectly named code shards during file modularization.

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PR created automatically by Jules for task 7562642115794322206 started by @theRebelliousNerd

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1e0d7718-809c-445b-9682-0623c1986cf0

📥 Commits

Reviewing files that changed from the base of the PR and between cc0e10f and 89ce783.

📒 Files selected for processing (2)

• internal/campaign/edge_case_detector.go
• internal/campaign/edge_case_detector_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-unknown-file-extensions-TODO-7562642115794322206

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