Consolidate Telegram PR and issue notifications in Baseline

[ineedjet]

🤖 [rubykatzen/baseline]:

Goal

Move pull request and issue Telegram notifications into Baseline and export independent reusable workflows. PR notifications are a baseline repository capability; issue notifications are optional and may use a different Telegram channel.

Implemented

• Added notify-telegram-pr-shared.yml for opened, reopened, ready, merged, and scheduled open-PR notifications.
• Added notify-telegram-issue-shared.yml for closed-issue notifications.
• Split PR preparation, issue preparation, and generic Telegram delivery into dedicated internal actions.
• Added Baseline own PR notification caller using a local shared-workflow reference.
• Passed TELEGRAM_BOT_TOKEN and TELEGRAM_CHAT_ID explicitly.
• Kept issue filtering and channel selection in consumer callers.
• Tested routing, draft and merge filtering, formatting, digest limiting, and empty digest behavior.
• Documented both reusable workflows.
• Retired the unreleased-commit digest because Release Please exposes release readiness as an open pull request.
• Released the implementation in Baseline.

Follow-ups

• Consumer migration is tracked separately in Migrate Telegram notification consumers to Baseline #148.
• Archival of the four superseded standalone action repositories is tracked separately in Archive superseded Telegram action repositories #149.
• Releaser cleanup belongs to the planned Releaser archival and is intentionally outside this issue.
• Existing Releaser issues will be reviewed and closed independently.

Result

Baseline now owns independent reusable PR and issue Telegram workflows, and consumers can route them to separate channels without granting access to unrelated secrets. The remaining rollout and archival work is isolated in dedicated issues.

🔔🧹✅

[ineedjet]

🤖 [rubykatzen/baseline]:

Baseline implementation is available in #139. It adds separate reusable PR and issue notification workflows, explicit Telegram secret passing, tested message formatting, the local PR caller, and removal of the redundant unreleased digest. Consumer migration, Releaser cleanup, and legacy repository archival remain follow-up stages after the Baseline release.

📬 🧪 🚀

[ineedjet]

🤖 [rubykatzen/baseline]:

The Baseline implementation is complete and released. Remaining work has been separated into #148 for consumer migration and #149 for legacy repository archival. Releaser cleanup will be handled as part of Releaser archival, and its existing issues will be reviewed independently.

Closed as completed.

🔔✂️✅