Add portable fork workflows and native session creation

[krishhgg]

Summary

• Add a shared controller for portable attachment, task-specific dynamic context, and actual native Codex/Claude child sessions.
• Preserve paired public tool evidence, freeze completed boundaries, and disclose omissions. Keep T3 as an optional source adapter.
• Publish the approved README and diagrams together with their implementation; move historical benchmarks to a separate document.

Verification

• 56 tests passed on Python 3.12 and Python 3.9, with real Codex and Claude native smoke tests enabled.
• JavaScript syntax, skill validation, and diff whitespace checks passed.
• Opus 5.5 at high reviewed the implementation; findings were fixed and its final review approved.

Limits

• Portable attachment is not a lossless cross-provider clone.
• Native creation does not create worktrees or register a new T3 UI thread.
• Dynamic context remains experimental; no generalized speed, cost, or output-quality claim.

This PR includes the documentation preview previously published on docs/readme-preview.

Confidence Score: 5/5

The PR appears safe to merge; the prior Node support mismatch is fully resolved and no new actionable issue was identified.

Summary

This PR adds a shared controller for portable conversation attachment, frozen and paginated history snapshots, dynamic context packaging, and native Codex and Claude child-session creation.

• Adds source-specific history adapters with completed-boundary handling, public tool evidence, omission reporting, and secret-like record screening.
• Adds verified native fork adapters for Codex app-server and the Claude Agent SDK.
• Expands automated and opt-in integration coverage across supported Python versions, Node 20, Linux, and macOS.
• Updates the skill contract, workflow documentation, diagrams, and README while separating historical benchmark results.
• The previously reported Node compatibility mismatch is fixed consistently across code, lockfile, CI, and documentation.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  ID[Conversation ID] --> Resolve[Resolve source and completed boundary]
  Resolve --> Route{Requested route}
  Route -->|Attach| Snapshot[Create private frozen snapshot]
  Snapshot --> Pages[Read or retrieve verified pages]
  Pages --> Current[Continue in current chat]
  Route -->|Native| Plan[Plan provider-native fork]
  Plan --> Execute[Execute explicit fork request]
  Execute --> Child[Return verified child ID and resume command]
  Route -->|Dynamic| Select[Validate agent-selected records]
  Select --> Bundle[Create recoverable context bundle]

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