fix: rename GWS/GH tasks to manifest convention

[ScuttleBot]

Remove numeric prefixes from task files added in #172:

• task_26_gws_email_triage → task_gws_email_triage
• task_27_gws_cross_service → task_gws_cross_service
• task_28_gws_task_management → task_gws_task_management
• task_29_gh_issue_triage → task_gh_issue_triage

Also updates the id field in each task frontmatter and adds them to manifest.yaml.

Follows up on #172 to align with the manifest-based task ordering introduced earlier.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Clean rename PR — numeric prefixes removed consistently across filenames, id fields in frontmatter, and manifest.yaml entries. The changes are coherent and follow the established manifest convention.

Files Reviewed (5 files)

• tasks/manifest.yaml
• tasks/task_gws_email_triage.md (renamed from task_26_gws_email_triage.md)
• tasks/task_gws_cross_service.md (renamed from task_27_gws_cross_service.md)
• tasks/task_gws_task_management.md (renamed from task_28_gws_task_management.md)
• tasks/task_gh_issue_triage.md (renamed from task_29_gh_issue_triage.md)

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_{Reviewed by claude-4.6-sonnet-20260217 · 73,830 tokens}