Summary

Remove dead model/thinking/reasoning/elevated/exec infrastructure — inline directive type fields, model directive parser, thinking-level types and normalization, help text references, and the stop command registry entry with its stub handlers.

Closes #2134

What was removed

• Model directive parser (model.ts) and its tests — extractModelDirective() ran during parse but result was never acted on
• Thinking/reasoning/elevated types (ThinkLevel, ElevatedLevel, ReasoningLevel) and their normalization functions — CLI agents manage their own thinking/reasoning levels
• Dead InlineDirectives fields — hasModelDirective, hasThinkDirective, hasReasoningDirective, hasElevatedDirective, hasExecDirective and associated data fields (never populated to true)
• directive-handling.levels.ts — resolved current think/reasoning/elevated levels from session (dead without the types)
• stop command — registry entry + handleStopCommand/handleAbortTrigger stub handlers (real abort mechanism in abort.ts is untouched)
• Help text references — /compact, /stop, /think, /model, /context, /skill removed from buildHelpMessage()

What was kept

• VerboseLevel, normalizeVerboseLevel, NoticeLevel, normalizeNoticeLevel, UsageDisplayLevel, normalizeUsageDisplay, resolveResponseUsageMode — alive infrastructure
• Verbose and queue directive fields on InlineDirectives
• abort.ts and abort-cutoff.ts — real abort mechanism
• Telegram's local TelegramReasoningLevel type — separate local type

Files affected

• 3 files deleted, 20 files modified
• Net: -799 lines deleted, +38 lines added

Test plan

• pnpm build succeeds
• pnpm test passes (693 files, 5923 tests)
• pnpm check passes (format + typecheck + lint)
• All acceptance criteria from gut(commands): remove 11 gutted/vestigial command definitions #2134 verified via grep

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