trace: add execution route visibility + debug passthrough; phase2170 canaries; docs
- Add HAKO_TRACE_EXECUTION to trace executor route
- Rust hv1_inline: stderr [trace] executor: hv1_inline (rust)
- Hakovm dispatcher: stdout [trace] executor: hakovm (hako)
- test_runner: trace lines for hv1_inline/core/hakovm routes
- Add HAKO_VERIFY_SHOW_LOGS and HAKO_DEBUG=1 (enables both)
- verify_v1_inline_file() log passthrough with numeric rc extraction
- test_runner exports via HAKO_DEBUG
- Canary expansion under phase2170 (state spec)
- Array: push×5/10 → size, len/length alias, per‑recv/global, flow across blocks
- Map: set dup-key non-increment, value_state get/has
- run_all.sh: unify, remove SKIPs; all PASS
- Docs
- ENV_VARS.md: add Debug/Tracing toggles and examples
- PLAN.md/CURRENT_TASK.md: mark 21.7 green, add Quickstart lines
All changes gated by env vars; default behavior unchanged.
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