chore(trunk): add linter configs and update versions

- Add .markdownlint.yaml with prettier-friendly config
- Add .yamllint.yaml with custom rules
- Enable yamllint and markdownlint in trunk.yaml
- Update Go runtime to 1.26.0
- Update linter versions (checkov, golangci-lint2, osv-scanner, trufflehog)
- Enable pre-push and pre-commit hooks
- Update .gitignore to track .trunk/configs directory

.trunk/configs/.markdownlint.yaml

@@ -0,0 +1,2 @@
+# Prettier friendly markdownlint config (all formatting rules disabled)
+extends: markdownlint/style/prettier

.trunk/configs/.yamllint.yaml

@@ -0,0 +1,7 @@
+rules:
+  quoted-strings:
+    required: only-when-needed
+    extra-allowed: ["{|}"]
+  key-duplicates: {}
+  octal-values:
+    forbid-implicit-octal: true