docs: record messaging phase 3 readiness

[gaelic-ghost]

Summary

• document the iMessage, Push-to-Talk/Lambda, default-messaging, and Discord reference consumers
• inventory supported native and agent integration hooks with explicit platform boundaries
• define the evidence gate before extracting shared Phase 3 helpers

Verification

• uv run scripts/validate_socket_metadata.py
• git diff --check

Summary by CodeRabbit

• Documentation
  • Added a Phase 3 readiness plan for messaging collaboration integrations.
  • Documented supported platform hooks, integration boundaries, authorization requirements, validation scenarios, and helper readiness criteria.
  • Added reference coverage for iMessage, Push-to-Talk, default messaging, and Discord scenarios.
  • Linked the readiness plan from the messaging collaboration skills roadmap and updated milestone tracking.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5109711c-4051-41c6-a780-a778a48bbf5d

📥 Commits

Reviewing files that changed from the base of the PR and between 010b3af and 60a210d.

📒 Files selected for processing (3)

• ROADMAP.md
• docs/maintainers/messaging-collaboration-phase-3-readiness-plan.md
• docs/maintainers/messaging-collaboration-skills-plugin-plan.md

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📝 Walkthrough

Walkthrough

Adds a Phase 3 readiness plan for messaging collaboration reference consumers, integration boundaries, and shared-helper criteria, then links it from the skills plan and roadmap checklist.

Changes

Messaging collaboration Phase 3

Layer / File(s)	Summary
Phase 3 readiness plan docs/maintainers/messaging-collaboration-phase-3-readiness-plan.md	Defines readiness gates, reference consumer scenarios, supported hooks, agent integration requirements, helper criteria, candidate helpers, and sources.
Roadmap and plan integration docs/maintainers/messaging-collaboration-skills-plugin-plan.md, ROADMAP.md	Links the readiness plan from the Phase 3 plan and adds a roadmap checklist entry for readiness evidence.
Estimated code review effort: 1 (Trivial)	~5 minutes

Possibly related PRs

• gaelic-ghost/socket#141: Updates the same messaging-collaboration milestone and planning documentation.

Suggested labels: documentation

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/messaging-phase3-readiness

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