Add specification for new comment detection and context reflection (#68)

* Initial plan

* Add COMMENT_DETECTION_SPECIFICATION.md with detailed design for new comment detection

Co-authored-by: notfolder <20558197+notfolder@users.noreply.github.com>

* Update COMMENT_DETECTION_SPECIFICATION.md based on review feedback: remove config additions, use existing settings, add pause/resume state persistence

Co-authored-by: notfolder <20558197+notfolder@users.noreply.github.com>

* Clarify get_state/restore_state method return structure in COMMENT_DETECTION_SPECIFICATION.md

Co-authored-by: notfolder <20558197+notfolder@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: notfolder <20558197+notfolder@users.noreply.github.com>

Author: Copilot