chore: bootstrap repository with governance docs

Initialize git, add Apache-2.0 LICENSE, .gitattributes (LF line
endings), AGENTS.md (entry points, stack, discovery order, baseline
checks), RUNBOOK.md (dev boot, prod deploy with overlay, ingestion,
failures, rollback, scaling notes), .env.prod.example with rotated
credential placeholders, and dev-only warnings on .env.example.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1,23 @@
+* text=auto eol=lf
+*.py    text eol=lf
+*.ts    text eol=lf
+*.tsx   text eol=lf
+*.css   text eol=lf
+*.md    text eol=lf
+*.json  text eol=lf
+*.yml   text eol=lf
+*.yaml  text eol=lf
+*.toml  text eol=lf
+*.ini   text eol=lf
+*.mako  text eol=lf
+*.svg   text eol=lf
+*.cfg   text eol=lf
+Dockerfile text eol=lf
+Makefile   text eol=lf
+*.png   binary
+*.jpg   binary
+*.gif   binary
+*.pdf   binary
+*.ico   binary
+*.woff  binary
+*.woff2 binary