feat: yaml model manager and /model commands

[Li0k]

PR Title: Model config YAML-only + simplified /model UX

Summary

• Switched to YAML-only model configuration in .aloop/models.yaml; removed legacy env-based hints and name field usage.
• Simplified /model UX to two commands: picker (/model) and editor (/model edit) with auto-reload on save.
• Added Codex-style model picker and extracted model TUI helpers into utils/tui/model_ui.py (deduped helpers like mask_secret, parse_kv_args).
• Updated model switching to keep MemoryManager/compressor in sync with the active LLM.
• Improved local validation: no API key required when api_base points to localhost; file-save detection uses mtime_ns + size.
• Documentation & RFC updated for the new design; RFC-006 marked Completed.

Key changes

• llm/model_manager.py: YAML schema without name, local api_base key exemption, cleanup.
• interactive.py: only /model and /model edit; uses shared TUI helpers.
• utils/tui/model_ui.py: centralized picker/editor helpers + secret masking.
• agent/base.py: switch_model keeps memory/compressor LLMs in sync.
• Docs/RFC: consistent .aloop/models.yaml format and updated UX.

Tests

• ./scripts/dev.sh check

Notes

• .aloop/models.yaml remains gitignored; no secrets committed.

Checklist

• Updated docs to match YAML-only config
• Updated RFC-006 status and content
• Ensured /model UX matches implementation
• Tests passed (./scripts/dev.sh check)

[Copilot]

Pull request overview

This PR implements YAML-based model configuration and interactive model management commands, replacing the legacy environment variable and .aloop/config model configuration system.

Changes:

• Introduces ModelManager class for managing models via .aloop/models.yaml
• Adds /model command with picker UI and edit subcommand for runtime model switching
• Removes all legacy LITELLM_* and provider-specific API key configuration from .aloop/config
• Updates documentation, examples, and tests to use the new YAML configuration

Reviewed changes

Copilot reviewed 20 out of 21 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
llm/model_manager.py	New ModelManager class for YAML-based model configuration
llm/init.py	Exports ModelManager and ModelProfile
utils/tui/model_ui.py	New TUI helpers for model picker and config editor
utils/tui/status_bar.py	Adds model_name field to status bar display
interactive.py	Implements /model commands and ModelSetupSession
main.py	Updates agent creation to use ModelManager
agent/base.py	Adds switch_model and get_current_model_info methods
config.py	Removes all LITELLM_* configuration
test/test_smart_edit_integration.py	Updates test to use ModelManager
docs/*.md	Updates documentation for new YAML-based config
examples/*.py	Updates examples to use ModelManager
rfc/006-multi-model-v2.md	New RFC documenting the design
pyproject.toml	Adds PyYAML dependency

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