- Start g3 in plan mode with ' >>' prompt and welcome message
- Add is_approval_input() to detect 'approve', 'a', 'yes', etc. and misspellings
- Allow trailing punctuation (!, ., ,) on approval words
- Call plan_approve tool directly without LLM when approval detected
- Add synthetic assistant message after approval for LLM context
- Exit plan mode after successful approval, return to 'g3>' prompt
- CTRL-D in plan mode exits plan mode first, then exits g3
- /plan command enters plan mode and shows welcome message
- Agent mode (--agent) does not start in plan mode
- Add CommandResult enum to signal plan mode entry from commands
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