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>

.gitignore

@@ -0,0 +1,11 @@
+node_modules/
+dist/
+*.log
+.DS_Store
+report.*.json
+
+# Harness runtime artifacts (per-consumer-repo; here only for fixtures)
+.agents/.cache/
+.agents/runs/*/events.ndjson
+.agents/runs/*/board.md
+tests/.tmp/