feat: rc10 UX improvements + stall warning fixes (#186, #187, #188)

[Nathan Schram (nathanschram)]

Summary

• Emoji buttons + edit-in-place for outline approval — ExitPlanMode buttons now show ✅/❌/📋 emoji prefixes; post-outline approval edits feedback message in-place instead of creating a second message #186
• Redesign startup message layout — italic subheadings, split engine lines, renamed "projects" to "directories", added bug report link #187
• 🧹 emoji on /new session clear messages
• Succinct stall warnings — truncate Last: to 80 chars, recognise command: prefix for Bash, reassuring "still running" when CPU active, drop PID diagnostics from Telegram, "may be stuck" only when genuinely stuck #188
• Frozen ring escalation fix — when a known tool is running (main sleeping, CPU active on children), show "Bash command still running" instead of alarming "No progress" message #188

Test plan

• 125 exec_bridge tests pass (124 existing + 1 new frozen ring test)
• 244 related tests pass (exec_bridge + exec_runner + claude_control)
• Integration tested via @untether_dev_bot: emoji buttons, outline flow, /new emoji, all 6 engines
• CI pipeline: format, ruff, ty, pytest (3.12/3.13/3.14), build, lockfile, pip-audit, bandit

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