[pull] main from gi-dellav:main

[pull]

See Commits and Changes for more details.

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Created by pull[bot] (v2.0.0-alpha.4)

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Note

Add session rewind/redo commands and exponential backoff retry logic for agent streams

• Adds /rewind and /redo slash commands: /rewind opens a two-stage modal picker to select a prior user turn, truncates the session to that point, and restores the user's original input; /redo restores the truncated messages if no new messages have been added since.
• Introduces a new retry module (src/retry.rs) with RetryConfig (default: 3 attempts, 500ms–10s exponential backoff with jitter), with_retry, and retry_stream_chat helpers used across agent runner, advisor, ACP, and provider.
• Propagates RetryConfig from Config.retry through all spawn_runner, run_print, spawn_btw, and run_subagent call sites; emits AgentEvent::Retrying { attempt, max } in the UI during backoff.
• Adds YAML/YML config file support alongside TOML and JSON, updating load/save logic, documentation, and tests to prefer config.toml → config.yaml → config.yml → config.json.
• Risk: undo_last now calls session.rewind_to instead of session.truncate_to, making /undo reversible — existing behavior is preserved but the operation is now undoable via /redo.

^{Macroscope summarized 9d4fe39.}