New self-contained chat modules extracted from dashboard-v2-structure:
- chat/slash-commands.ts: slash command definitions and completions
- chat/slash-command-executor.ts: execute slash commands via gateway RPC
- chat/slash-command-executor.node.test.ts: test coverage
- chat/speech.ts: speech-to-text (STT) support
- chat/input-history.ts: per-session input history navigation
- chat/pinned-messages.ts: pinned message management
- chat/deleted-messages.ts: deleted message tracking
- chat/export.ts: shared exportChatMarkdown helper
- chat-export.ts: re-export shim for backwards compat
Gateway fix:
- Restore usage/cost stripping in chat.history sanitization
- Add test coverage for sanitization behavior
These modules are additive and tree-shaken — no existing code
imports them yet. They will be wired in subsequent slices.
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