* Add native chat skill and command picker with host-aware discovery
Adds a unified, keyboard-first skill and command picker to native chat that:
- Uses agent-native invocation syntax (slash for Claude/OpenClaude/Grok, dollar for Codex)
- Discovers skills only on the pane's execution host (local, WSL, SSH-unavailable, or runtime)
- Groups or separates commands and skills per agent configuration
- Deduplicates by canonical path but preserves visibility through all contributing roots
- Handles IME composition, loading states, and errors without claiming PTY-level control
- Records picker telemetry (open, item accepted, send classification, discovery outcomes)
- Extends shared agent profiles to define per-agent skill grammars and source ownership
* Remove obsolete reference and design documentation
Clean up stale design specs, implementation plans, and investigation notes from
docs/reference/. These documents predate the current implementation and are no
longer actively maintained or referenced by the codebase.
* Extract shared skill discovery utilities and add skill invocation envelo
- Move skill comparison and source classification to shared module for native/WSL reuse
- Extract display text sanitization to prevent control/zero-width character spoofing
- Add native-chat command envelope parser and surfacer for skill invocations
- Extend discovery timeout backstop to account for WSL metadata read sequence
* Localize skill picker UI for Spanish, Japanese, Korean, Chinese
Translate skill picker UI strings including commands, skills, loading
states, error messages, and scope labels for the new skill picker feature
across four language locales.
* Fix skill picker bugs and improve code robustness
- Fix i18n plural handling: rename `count` to `sourceCount` to prevent unintended plural-key resolution in localized strings
- Fix skill discovery array mutations: copy `root.providers` to prevent bugs during dedup merge
- Fix image attachments being silently dropped when message text starts with /skill or agent prefix
- Extract `quoteBashString` utility for WSL command code reuse across builders
- Add line-separator safety characters (0x2028/0x2029) to skill display filter
- Remove stale doc reference links and clarify inline comments
* Add reference docs for git compatibility and headless Linux server setup
Track previously untracked operational guides in `docs/reference/` that
explain Git binary compatibility requirements across host types and how to
run `orca serve` on headless Linux. Update AGENTS.md and README.md to link
to these references.
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