Add issue and PR comment notifications

[Kingvic300]

Summary

issue_comment.created is not handled. Comments on issues and PRs — often where real blockers or questions surface — currently produce no Telegram notification.

Background

The webhook subscription list in the README (setup step 5) only mentions Issues, Pull requests, Workflow runs, and Deployment statuses. src/github/webhooks.ts has no issue_comment handler at all. A question or "blocked on X" comment left on a PR is invisible until someone happens to check GitHub.

Proposed Solution

Add a webhooks.on("issue_comment.created", ...) handler. Use payload.issue.pull_request presence to distinguish "comment on a PR" from "comment on an issue" and label the notification accordingly, reusing the existing link/icon helpers in formatters.ts.

Technical Scope

• src/github/webhooks.ts — new handler
• src/github/formatters.ts — new formatCommentEvent
• README.md — add "Issue comments" to the webhook subscription list
• Tests: formatter unit test for both issue-comment and PR-comment cases

Acceptance Criteria

• New comments on issues produce a notification distinct from comments on PRs
• Comment body is truncated/escaped safely (reuse escapeHtml) before posting
• Unit tests added
• README updated
• CI passes
• Code follows project conventions

Edge Cases

• Very long comment bodies — must be truncated to a reasonable preview length before posting to Telegram
• Comments containing HTML-significant characters must be escaped (reuse src/utils/html.ts)
• Bot-authored comments (e.g. from other automation) — consider whether to filter these out to avoid notification loops

Risks

• Highest noise-per-event of any handler in this backlog on an active repo — should ship alongside or after issue Add issue and PR comment notifications #6 (label-based filtering) to avoid flooding the channel
• No structural risk to existing handlers

Deliverables

• Feature implementation
• Unit tests
• README update

Labels

enhancement, backend

Priority

Medium — real value, but noise risk means it should land with filtering in place.

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Estimated Completion: 96 hours

Telegram: https://t.me/txioCommunity

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[Kingvic300]

📢 Need help or have questions on this issue? Join the Txio Telegram community for support: https://t.me/txioCommunity

[Promise278]

i have experience with sytem design and archecture i would love to work on these please

[grantfox-oss]

🦊 GrantFox — @Promise278 has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #6)
2. Your PR will be reviewed by the Txio-labs maintainers

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