docs: Add CLAUDE.md and Claude Code settings

Operational doctrine migrated from Vigilance HQ — V4_WORKFLOW, engagement
rules, and lessons learned carry forward. Project-specific sections written
for Corrosion's Rust/Axum + Vue 3 + Go stack. Claude Code settings configured
with permissions for cargo, go, npm, docker, and git operations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/settings.json

@@ -0,0 +1,44 @@
+{
+  "dangerouslySkipPermissions": true,
+  "permissions": {
+    "allow": [
+      "Bash(npm install:*)",
+      "Bash(npm uninstall:*)",
+      "Bash(npm run build:*)",
+      "Bash(npm run dev:*)",
+      "Bash(npm run lint:*)",
+      "Bash(npm run test:*)",
+      "Bash(cargo build:*)",
+      "Bash(cargo run:*)",
+      "Bash(cargo check:*)",
+      "Bash(cargo clippy:*)",
+      "Bash(cargo test:*)",
+      "Bash(go mod tidy:*)",
+      "Bash(go build:*)",
+      "Bash(go test:*)",
+      "Bash(make:*)",
+      "Bash(git add:*)",
+      "Bash(git commit:*)",
+      "Bash(git status:*)",
+      "Bash(git push:*)",
+      "Bash(git log:*)",
+      "Bash(git diff:*)",
+      "Bash(docker compose:*)",
+      "Bash(docker logs:*)",
+      "Bash(docker exec:*)",
+      "Bash(ls:*)",
+      "Bash(find:*)",
+      "Bash(wc:*)",
+      "Bash(grep:*)",
+      "Bash(test:*)",
+      "Bash(echo:*)",
+      "Bash(chmod:*)",
+      "Bash(node -e:*)",
+      "Bash(npx:*)",
+      "WebSearch",
+      "WebFetch(domain:github.com)",
+      "WebFetch(domain:docs.rs)",
+      "WebFetch(domain:crates.io)"
+    ]
+  }
+}