fix: resolve silent stop bugs in Clone Loop, remove dead scripts, add .gitignore

[Turtle-Hwan]

Summary

• Session mismatch silent stop: session ID rotation (e.g. after context compaction) no longer kills the loop — state file is patched in memory and execution continues
• stop_recommended silent stop: replaced silent natural-stop with a visible block() using bold-purple header "Clone predicted the task is complete. Additional user instruction is needed."
• Remove 3 one-off manual e2e scripts (manual-e2e-compare.mjs, manual-e2e-compare3.mjs, manual-e2e-multiturn.mjs) — covered by automated tests
• Add .gitignore — node_modules/, .claude/, .env, editor/OS artifacts

Test plan

• pnpm test — 26/26 pass
• New test: continues the loop and updates session_id when session IDs change
• Updated test: blocks with a satisfaction message when Clone signals stop_recommended now asserts decision: block + purpleBold header text

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