t1385.4: Add iMessage/BlueBubbles subagent doc

[marcusquinn]

Summary

• Add comprehensive iMessage/BlueBubbles bot integration subagent doc
• Two integration paths: BlueBubbles (full-featured REST API) and imsg CLI (send-only)
• Covers: architecture, API reference, webhooks, messaging features, macOS keepalive, access control, encryption/privacy assessment, aidevops runner dispatch integration

Changes from PR #2762 (closed)

Addresses all CodeRabbit and Gemini review feedback:

1. BlueBubbles Homebrew cask deprecation warning (disabled 2026-09-01) — recommends DMG download from GitHub Releases
2. check_and_restart uses pgrep -x (exact match) instead of pgrep -f (substring)
3. Encryption table corrected: separates content encryption, key-wrapping, and authentication; removes unsupported RSA-2048 claim; states RSA-OAEP/ECIES per Apple docs; notes ECIES since iOS 13; ECDSA P-256 for signing/authentication
4. Removed unused bundle_id parameter from check_and_restart function; only suppress stdout (not stderr) in pgrep
5. Rebased onto main

Closes #2751

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📥 Commits

Reviewing files that changed from the base of the PR and between 7e385b9 and d1afc2a.

📒 Files selected for processing (1)

• .agents/services/communications/imessage.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/t1385.4-imessage-subagent

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🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 113 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Tue Mar 3 05:09:28 UTC 2026: Code review monitoring started
Tue Mar 3 05:09:28 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 113

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 113
• VULNERABILITIES: 0

Generated on: Tue Mar 3 05:09:31 UTC 2026

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Generated by AI DevOps Framework Code Review Monitoring

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud