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/architecture.md

@@ -0,0 +1,30 @@
+# {{PROJECT}} architecture
+
+<!-- Living document. Update when components, data flow, invariants, or ADR outcomes change. Keep claims concrete and current. -->
+
+## Purpose
+
+Describe what this system exists to do, who uses it, and what success means.
+
+## System context
+
+List upstream callers, downstream services, data stores, queues, files, and trust boundaries.
+
+## Components
+
+- Component: responsibility, owner, key files.
+
+## Data flow
+
+1. Input source.
+2. Validation and transformation.
+3. Persistence or external calls.
+4. Output and observability.
+
+## Key invariants
+
+- Invariant: why it must hold, where enforced, how verified.
+
+## Decision log (ADRs)
+
+<!-- Append ADR links or summaries here. Newest last. -->