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/conventions.md

@@ -0,0 +1,38 @@
+# {{PROJECT}} conventions
+
+<!-- Living document. Promote repeated review feedback and user corrections here. Keep rules specific, checkable, and current. -->
+
+## Code style
+
+- Prefer simple control flow and explicit names.
+- Keep side effects at boundaries.
+
+## Naming
+
+- Use domain terms consistently.
+- Name files after their primary responsibility.
+
+## Testing
+
+- Cover changed behaviour with the smallest meaningful test.
+- Add regression tests for fixed bugs.
+
+## Error handling
+
+- Fail fast on invalid inputs.
+- Preserve actionable error context without leaking secrets.
+
+## Commit format
+
+- Use concise conventional commits when possible.
+- Explain why in the body when not obvious.
+
+## Directory layout
+
+- Keep generated artifacts out of source directories.
+- Put shared deterministic helpers in library modules.
+
+## Review rules
+
+- Verify scoped files only.
+- Flag correctness, security, and contract drift before style.