bug(commands): four Pi commands completely dead, four more hidden from discovery

[akougkas]

Problem

Shell-overrides.ts hides all 19 Pi built-in commands. Of these:

Dead commands (hidden, no patch, unreachable):

• /scoped-models: Controls which models appear in Ctrl+P cycling. No PanCode equivalent. Users cannot configure model cycling.
• /changelog: Shows version information. No PanCode equivalent.
• /resume: TUI session switcher. Users cannot resume previous sessions.
• /quit: Standard quit command. Users must discover PanCode's /exit instead.

Hidden but functional (no autocomplete, not in /help):

• /export: Export session to HTML
• /copy: Copy last message to clipboard
• /fork: Branch from previous message
• /tree: Navigate session history

Pi's hardcoded dispatch still routes these, so they work if typed manually. But users cannot discover them through autocomplete or /help.

Audit Reference

AUDIT-ISSUES.md: B3, B4

Objective

Restore access to valuable Pi commands. Remove hiding for commands PanCode does not need to replace.

Deliverables

• Determine which Pi commands should remain hidden vs restored
• At minimum: unhide /export, /copy, /fork, /tree, /resume (pure Pi features PanCode doesn't replace)
• Create PanCode equivalents for /scoped-models (model cycling config) or unhide Pi's
• Add /fork, /tree, /export, /copy to PanCode's /help output under a "Pi SDK" category
• Update /hotkeys to mention /quit as an alternative to /exit