Test selected capabilities across availability and resume

[jif-oai]

Why

This stack crosses World State, executor skills, selected plugin metadata, MCP processes, connectors, dynamic environments, and resume. This PR adds two end-to-end scenarios that validate those pieces together.

Both tests enable deferred_executor, so they exercise the real delayed-environment path.

Scenario 1: availability across turns and resume

1. Start a thread with one selected plugin root bound to E1.
2. E1 is unavailable.
   - executor skill is absent
   - selected MCP is absent
   - connector has no selected-plugin attribution
3. Start E1 and register the same stable environment ID.
4. Start a new turn.
   - the executor skill appears through World State
   - its body beats a colliding host skill
   - the selected MCP tool is advertised and executes inside E1
   - the connector is attributed to the selected plugin
5. Start another turn without changing E1.
   - the MCP PID stays the same, proving runtime reuse
6. Restart app-server and resume the thread.
   - durable selected-root intent is restored
   - skills, MCP, and connector attribution are restored
   - a new MCP PID proves ephemeral process state was rebuilt

Scenario 2: availability changes inside one turn

1. Start a turn while E1 is unavailable.
2. The first model sample sees no executor skill, MCP, or selected connector.
3. The turn pauses on request_user_input.
4. Start E1 and register it while that same turn is still active.
5. Continue the turn.
6. The very next model sample sees:
   - the executor skill catalog
   - the selected MCP tool
   - selected-plugin connector attribution
7. The model calls the MCP, and its output proves execution happened inside E1.

This second scenario specifically protects the aeon-style behavior: capability state is captured again for every sampling step, not only at the next user turn.

Scope

These are integration tests only. They do not add a combinatorial matrix for unsupported plugin-file mutation, environment generations, transport disconnects, or delayed required = true executor MCPs.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: c38d428177

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".