docs: enhance release flow documentation and add version command to CLI

- Updated AGENTS.md and README.md to clarify the automated release process using release-please and GoReleaser.
- Added a version command to the envc CLI to display build metadata.
- Included CI/CD details in README for better understanding of testing and release automation.

release-please-config.json

@@ -0,0 +1,28 @@
+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "release-type": "go",
+  "bump-minor-pre-major": true,
+  "bump-patch-for-minor-pre-major": false,
+  "include-v-in-tag": true,
+  "include-component-in-tag": false,
+  "pull-request-title-pattern": "chore${scope}: release ${version}",
+  "changelog-path": "CHANGELOG.md",
+  "changelog-sections": [
+    { "type": "feat", "section": "Features" },
+    { "type": "fix", "section": "Bug Fixes" },
+    { "type": "perf", "section": "Performance Improvements" },
+    { "type": "revert", "section": "Reverts" },
+    { "type": "refactor", "section": "Code Refactoring" },
+    { "type": "docs", "section": "Documentation" },
+    { "type": "test", "section": "Tests", "hidden": true },
+    { "type": "build", "section": "Build System", "hidden": true },
+    { "type": "ci", "section": "Continuous Integration", "hidden": true },
+    { "type": "chore", "section": "Miscellaneous", "hidden": true },
+    { "type": "style", "section": "Styles", "hidden": true }
+  ],
+  "packages": {
+    ".": {
+      "package-name": "go-config"
+    }
+  }
+}