feat(httpmw): initial stable release v0.9.0

Standalone net/http middleware for panic recovery, CORS, request ID injection, and request logging.

What's included:
- Recover(): panic -> 500, captures debug.Stack, no logger required
- CORS(origins): OPTIONS 204 preflight, origin allowlist, package-wide method/header constants
- RequestID(generator): injects ID via logz.WithRequestID, sets X-Request-ID response header
- RequestLogger(logger): logs method/path/status/latency/request_id; Error for 5xx, Info otherwise
- Logger interface: Info, Error, With — duck-typed; satisfied by logz.Logger
- StatusRecorder: exported http.ResponseWriter wrapper that captures written status code
- Direct logz import for context helpers (documented exception to ADR-001)

Tested-via: todo-api POC integration
Reviewed-against: docs/adr/

.devcontainer/devcontainer.json

@@ -0,0 +1,26 @@
+{
+	"name": "Go",
+	"image": "mcr.microsoft.com/devcontainers/go:2-1.25-trixie",
+	"features": {
+		"ghcr.io/devcontainers-extra/features/claude-code:1": {}
+	},
+	"forwardPorts": [],
+	"postCreateCommand": "go version",
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"files.autoSave": "afterDelay",
+                "files.autoSaveDelay": 1000,
+                "explorer.compactFolders": false,
+                "explorer.showEmptyFolders": true
+			},
+			"extensions": [
+				"golang.go",
+				"eamodio.golang-postfix-completion",
+				"quicktype.quicktype",
+				"usernamehw.errorlens"
+			]
+		}
+	},
+	"remoteUser": "vscode"
+}