Fix stale thread focus and trim lower README screenshots

[zortos293]

What changed

• classify stopped T3 sessions as completed
• move focus away from historical or settled threads when active work exists
• clear stale detail, task, activity, and context state when focus changes or disappears
• remove all README image embeds at and below the Control panel section while retaining the explanatory text and source assets

Why

T3Notch could remain focused on a stopped historical thread and display Idle while another agent was running. The README also had more screenshots than desired below the control-panel section.

Validation

• all 31 Swift tests pass
• added regression coverage for stopped sessions and stale-focus reconciliation
• git diff --check passes
• confirmed no image embeds remain below the Control panel heading

Summary by CodeRabbit

• Improvements

  • Improved thread selection so focus remains on the active conversation when possible and moves automatically when it is no longer available.
  • Prevented outdated thread details from appearing after switching conversations.
  • Improved recognition of completed sessions, including stopped sessions without a latest turn.

• Documentation

  • Removed onboarding screenshots while retaining the written walkthrough and guidance.

[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: 6c8fd260-2939-48b6-9d8f-098f4951c4d8

📥 Commits

Reviewing files that changed from the base of the PR and between c8b2e0e and 651dea1.

📒 Files selected for processing (4)

• README.md
• Sources/T3Notch/AgentStore.swift
• Sources/T3NotchCore/Derivations.swift
• Tests/T3NotchCoreTests/DerivationTests.swift

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📝 Walkthrough

Walkthrough

AgentStore focus changes now share centralized transport and detail-reset handling. Focus preference and stopped-session completion logic were added to core derivations with tests. README walkthrough screenshots were removed while explanatory text was retained.

Changes

Thread focus and awareness

Layer / File(s)	Summary
Awareness and focus derivation Sources/T3NotchCore/Derivations.swift, Tests/T3NotchCoreTests/DerivationTests.swift	Stopped sessions are classified as completed, and preferred focus selection preserves active focus or chooses the first active thread, with coverage for historical, active, and empty-thread cases.
Centralized AgentStore focus flow Sources/T3Notch/AgentStore.swift	Review dismissal, manual selection, and shell snapshot application use shared focus replacement, transport synchronization, detail reset, and matching-detail guards.

README walkthrough cleanup

Layer / File(s)	Summary
Remove launch walkthrough screenshots README.md	First-launch, connection-test, and finished-agent screenshots are removed while the surrounding explanatory text remains.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant AgentStore
  participant Derivations
  participant Transport
  participant DetailStream
  AgentStore->>Derivations: Select preferred focused thread
  Derivations-->>AgentStore: Return active thread ID
  AgentStore->>Transport: Update focused thread
  AgentStore->>DetailStream: Reset and subscribe to focused detail
  DetailStream-->>AgentStore: Apply matching detail snapshot

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/fix-stale-focus-and-readme-images

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