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>

templates/spec.md

@@ -0,0 +1,32 @@
+# Spec: {{TITLE}}
+
+## Problem
+
+What user or system problem must be solved?
+
+## Scope
+
+### In
+
+- Included behaviour.
+
+### Out
+
+- Explicit non-goals.
+
+## Acceptance criteria
+
+1. Checkable outcome.
+2. Checkable outcome.
+
+## Constraints
+
+- Technical, product, security, timing, or compatibility constraints.
+
+## Risks
+
+- Risk: mitigation.
+
+## Verification plan
+
+- Command or manual check: expected result.