fix: recover truncated JSON responses and retry LLM generation

[machado144]

Summary

• Adds truncated JSON recovery: extracts release_notes field from partial responses when LLM hits token limit
• Adds retry logic (2 attempts) for both API failures and parse failures
• Falls back gracefully — if recovery and retries both fail, git fallback still works as before

Test plan

• go test ./... passes
• Truncated JSON with "release_notes": "..." is recovered
• Complete JSON still parses normally
• Git fallback is not affected (only triggers if all retries + recovery fail)

[github-actions]

✅ StructLint Validation

Metric	Count
Checks passed	49
Violations	0

[github-actions]

Core Changes

• Implemented retry logic for LLM generation and response parsing, allowing up to 2 attempts for transient failures.
• Added a robust mechanism to recover truncated JSON responses from LLMs, specifically extracting release_notes and suggested_version fields when the full JSON parsing fails.
• Enhanced error handling to log warnings for parse failures during retries and return the last encountered error if all attempts and recovery fail.

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Verdict

Approve: The changes significantly improve the robustness of LLM interactions by adding retry logic and a sophisticated mechanism to recover from truncated JSON responses. This addresses common failure modes in LLM APIs without introducing new issues.

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Code review performed by GEMINI - gemini-2.5-flash.