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/index/SKILL.md

@@ -0,0 +1,14 @@
+---
+name: index
+description: Use when needing repository understanding under a token budget before reading files by hand.
+---
+
+# index skill
+
+1. Run `lh index --budget <N> --focus <glob>`.
+2. Add `--stats` when onboarding or sizing work.
+3. Prefer index output before raw reads.
+4. Follow with `lh graph --brief` when structure matters.
+5. Read files by hand only after narrowing scope.
+
+Return paths and facts, not dumps.