GH#13496: tighten imessage.md — improve install step and encryption detail

[johnwaldo]

Summary

• Adds missing Drag to /Applications step in BlueBubbles install instructions (was skipping from download to right-click Open)
• Expands encryption detail from vague RSA-OAEP/ECIES P-256 to structured per-version breakdown: Classic → iOS 13+ → PQ3 (iOS 17.4+) with cipher modes
• All other content, structure, and line count preserved (156 lines, same as pre-regression)

Runtime Testing

Risk: Low — doc-only change, no code or agent behaviour modified. self-assessed.

Files Changed

• .agents/services/communications/imessage.md — 2 lines changed

Closes marcusquinn#13496

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[github-actions]

Maintainer Gate: BLOCKED

This PR cannot be merged because:

Issue marcusquinn#13496: API call failed — cannot verify assignee/labels.
What to do:

1. A maintainer must review the linked issue(s) and remove the needs-maintainer-review label
2. The issue(s) must have an assignee before work begins
3. This check re-runs automatically when the issue is updated

This is an automated check. See issue-triage-gate.yml for the triage policy.

[github-actions]

🔍 Code Quality Report

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

SonarCloud: 0 bugs, 0 vulnerabilities, 603 code smells

Mon Mar 30 03:43:06 UTC 2026: Code review monitoring started
Mon Mar 30 03:43:07 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 603

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 603
• VULNERABILITIES: 0

Generated on: Mon Mar 30 03:43:09 UTC 2026

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