feat(soul): add /reload-skills command to discover new skills without session restart

[cyliu0]

Related Issue

N/A

Description

Add /reload-skills soul-level slash command that rescans skill directories and rebuilds the slash command registry without restarting the session.

Changes

• /reload-skills: New soul-level slash command. Reloads skills from disk, updates the LLM context with the new skill list, and refreshes shell tab-completion.
• Runtime.reload_skills(): Rescans all skill directories and updates the KIMI_SKILLS builtin argument.
• Runtime.override_skills_dirs: New field to preserve the CLI --skills-dir intent. This fixes a bug where skills_dirs (used for Glob access) was incorrectly passed to resolve_skills_roots, causing project-level skills to be skipped during reload when user-level skills exist.
• KimiSoul.refresh_slash_commands(): Rebuilds the slash command registry after skills change.
• Shell UI: Automatically syncs slash commands from the soul and refreshes prompt completers after each turn.
• Tests: Add tests/core/test_reload_skills.py covering runtime reload, soul refresh, and builtin args update.
• Docs: Update changelog and user documentation (slash-commands, skills, interaction).

Checklist

• I have read the CONTRIBUTING document.
• I have linked the related issue, if any.
• I have added tests that prove my fix is effective or that my feature works.
• I have run make gen-changelog to update the changelog.
• I have run make gen-docs to update the user documentation.

[cyliu0]

Addressed all review comments in ff5111a:

1. Shell-mode completer bug (prompt.py + shell/init.py): now only rebuilds the agent-mode completer. Shell-mode commands are static (sourced from ) and never change dynamically, so the shell-mode completer no longer gets polluted with agent-only commands.

2. B018 bare string literals (agent.py): Converted the standalone triple-quoted strings under / to comments.

3. Unused import (test_reload_skills.py): Removed the unused import.

All fixes verified locally: , , and pass.

[cyliu0]

All review comments addressed and rebased onto latest main:

1. Shell-mode completer (Copilot): refresh_slash_completers() now only rebuilds the agent-mode completer. Shell-mode commands are static and never change dynamically.

2. skills_dirs reference break (Devin): reload_skills() now uses clear()+extend() instead of list assignment, preserving the reference held by the Glob tool.

3. Merge conflicts: Rebased onto latest main; regenerated CHANGELOG and release notes.

Verified locally: ruff, pyright, and pytest all pass.