Create worker Sessions for every issue and PR comment

[kelos-bot]

🤖 Kelos Agent @gjkim42

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

• makes kelos-workers create a durable Session for every new non-bot issue or PR conversation comment
• keeps /kelos pick-up as the explicit request to handle the complete issue or PR
• uses the PR head branch for PR comments and kelos-task- for issue comments
• updates the self-development documentation and adds matching and branch-template coverage

Which issue(s) this PR is related to:

N/A

Special notes for your reviewer:

Validation:

• make verify
• make test

This intentionally covers GitHub issue_comment deliveries, which represent issue comments and PR conversation comments. It does not add inline review-comment events.

Does this PR introduce a user-facing change?

NONE

---

Summary by cubic

Create a durable Session for every new non-bot issue or PR conversation comment. Keep /kelos pick-up as the opt-in to take full ownership; PR comments run on the PR head branch and issues use kelos-task-<number>, with a persistent workspace.

• New Features

  • Match all issue_comment created events for issues and PR conversations; exclude kelos-bot[bot]; inline review comments are not included.
  • Expanded initial prompt: PVC-backed workspace note, full comment context (body and URL), and clear immediate-request vs. /kelos pick-up ownership.
  • PR vs. issue flow: detect context up front, update incrementally, avoid self-closing issue refs on PR-triggered work, and clarify squash/CI steps; initialBranch uses PR head or falls back to kelos-task-{{.Number}}.
  • Switch to shared AgentConfig kelos-dev-agent and make guidance persistence-neutral; remove the inline worker AgentConfig.
  • Tests cover webhook matching and bot exclusion, persistent-workspace prompt, agent config reference, and branch rendering.
  • README: new trigger/behavior, shared AgentConfig, CommentBody/CommentURL template variables, and githubWebhook fields for SessionSpawner.

• Migration

  • Replace the old TaskSpawner and install the shared agent config:
    • kubectl delete taskspawner kelos-workers --ignore-not-found
    • kubectl apply -f self-development/agentconfig.yaml
    • kubectl apply -f self-development/kelos-workers.yaml

^{Written for commit 9d1f846. Summary will update on new commits.}