docs: update CHANGELOG for latest release

Author: anmolnagpal

CHANGELOG.md

@@ -0,0 +1,15 @@
+## [1.0.5] - 2026-02-25
+
+### 📚 Documentation
+- Added `docs/architecture.md` — architecture guidance and operational checklist
+- Added `docs/io.md` — full inputs/outputs reference table
+
+### 💡 Examples
+- Added `_examples/terragrunt/` — Terragrunt example with DO Spaces remote state and OpenTofu support
+
+### 👷 CI/CD & GitHub
+- Added `.github/ISSUE_TEMPLATE/` — bug report, feature request, and config templates
+- Added `SECURITY.md` — vulnerability reporting policy
+- Standardized all workflow SHA pins and removed `workflows.old/`
+- Upgraded `.pre-commit-config.yaml` to gruntwork-io/pre-commit v0.1.23 and pre-commit-hooks v4.5.0
+