[Improve] Show all linked pull requests in task surfaces

[roomote-roomote]

Opened on behalf of Daniel Riccio. Follow up by mentioning @roomote-roomote, in the web UI, or in Slack.

What changed

Task workspace headers and Task Info render every linked pull request with its canonical URL. Slack thread and automation footers expose all active linked PRs instead of selecting one. Automation footer actions use unique IDs and stay within Slack's actions-block limit.

Why this change was made

Tasks can span multiple repositories and pull requests. Showing only the first or latest PR hid part of the work and made multi-PR tasks difficult to review.

Impact

Users can see and open the complete active PR set from the existing task surfaces, while compact task-list badges retain their existing behavior. Provider-specific PR URLs are preserved, and multi-PR automation footers remain valid Slack blocks.

Screenshots

Single linked pull request

Multiple linked pull requests

Related PRs

• Demo seed data for single-PR and multi-PR tasks

[roomote-community]

No code issues found. See task

• packages/slack/src/automation-root-footer.ts:28 Reused Slack action IDs make multi-PR automation footers invalid.
• packages/slack/src/automation-root-footer.ts:25 Too many PR buttons can exceed Slack's 25-element actions-block limit.

_{Reviewed 0009795}

[roomote-roomote]

Addressed both unresolved Slack automation-footer comments in commit 6d1dc655: PR action IDs are unique per button, and the PR button list is capped at 24 to preserve Slack's 25-element actions-block limit alongside Go to task. Added regression tests; Slack tests and typecheck pass.

[roomote-roomote]

Updated the branch from develop and fixed the stale SDK footer assertion in commit 00097954. The required Test check is now green, all current checks are successful or intentionally skipped, and the seeded single-PR and multi-PR task states both render correctly. No repository-level blocker remains; the PR is still draft and must be marked ready for review before GitHub will allow merging.