feat: scaffold redsen-lean-harness v0.1.0

Recovered from crashed session (Node OOM). Repo contains full P0-P6
scaffold: plugin.json/marketplace.json, AGENTS.md, ADRs 0001-0006,
lh CLI (init/index/graph/lane/run/memory/host/report/doctor), 10
.github/agents, 12 CLI skills, instructions, context7 mcp.json, and
unit/e2e test suite.

Fixed: run.mjs read --in-tokens/--out-tokens but tests and CLI docs
use --input-tokens/--output-tokens, so telemetry totals were always 0.
Now accepts both forms.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/skills/plan/SKILL.md

@@ -0,0 +1,14 @@
+---
+name: plan
+description: Use when decisions are complete and the harness must produce a spec plus lane DAG before build.
+---
+
+# plan skill
+
+1. Read `.agents/specs/<slug>/decisions.md`.
+2. Invoke `.github/agents/architect.agent.md` for `.agents/specs/<slug>/spec.md`.
+3. Invoke `.github/agents/splitter.agent.md` for `.agents/specs/<slug>/plan.dag.json`.
+4. Run `lh graph --brief`.
+5. Report spec path, DAG path, acceptance ids, and blockers.
+
+Do not build before the DAG passes structural gates.