feat(seedgo): add silent-failure-detection and file-module-size plugins (#9)
Implements 2 High-priority Seed compliance checks:
**silent-failure-detection plugin:**
- Detects except: pass patterns that silently swallow exceptions
- Severity: ERROR (dangerous — hides bugs and failures)
- Catches bare except, Exception, and specific exception types with only pass
- Provides actionable fix hints: add logging or meaningful error handling
- 17 comprehensive tests
**file-module-size plugin:**
- Flags files exceeding 400 code lines (Seed threshold)
- Severity: WARNING (code smell, not always immediately fixable)
- Accurate line counting: excludes blanks, comments, and docstrings
- Smart fix hints based on file structure (classes, functions, mixed)
- 17 comprehensive tests
**Implementation details:**
- AST-based pattern matching for accuracy
- Follows existing plugin architecture (CheckResult, Severity)
- 478 total tests pass (34 new tests added)
- Both plugins pass Seed's own standards (80/100 score)
**Session 239** — Autonomous execution: Periodic wake identified High-priority Seed recommendations as highest-value work, deployed agent to implement, tested comprehensively.
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Co-authored-by: Claude <noreply@anthropic.com>
