fix(blog): correct internal links in v1.6.0 release post

Hugo generates date-based URLs (/:year/:month/:title/) not
filename-based paths. Fixed Rust, Terragrunt, and make-fix links.

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

Author: matthew-on-git

content/blog/2026-03-09-v160-release.md

@@ -8,13 +8,13 @@ v1.6.0 is the largest dev-toolchain release since launch. It adds the eighth lan
 
 ## Language and Tool Additions
 
-**Rust** is the eighth language ecosystem. The container ships clippy, rustfmt, cargo-audit, cargo-deny, and cargo test. The full toolchain is COPY'd from the official `rust:1-slim-bookworm` image, and security tools are installed via cargo-binstall. See the [Rust support announcement](/blog/2026-03-04-rust-support/) for details.
+**Rust** is the eighth language ecosystem. The container ships clippy, rustfmt, cargo-audit, cargo-deny, and cargo test. The full toolchain is COPY'd from the official `rust:1-slim-bookworm` image, and security tools are installed via cargo-binstall. See the [Rust support announcement](/blog/2026/03/rust-support/) for details.
 
-**Terragrunt** ships as a companion tool to Terraform. Projects that use `terragrunt.hcl` files get automatic format checking with zero additional configuration. See the [Terragrunt announcement](/blog/2026-03-05-terragrunt-support/) for how detection and gating work.
+**Terragrunt** ships as a companion tool to Terraform. Projects that use `terragrunt.hcl` files get automatic format checking with zero additional configuration. See the [Terragrunt announcement](/blog/2026/03/terragrunt-support/) for how detection and gating work.
 
 ## New Makefile Targets
 
-**`make fix`** runs formatters and auto-fixable linter rules in-place across all eight language ecosystems. The intended workflow: run `make fix` to auto-remediate, then `make check` to verify. See the [`make fix` announcement](/blog/2026-03-03-make-fix-and-mirror-automation/) for the full story.
+**`make fix`** runs formatters and auto-fixable linter rules in-place across all eight language ecosystems. The intended workflow: run `make fix` to auto-remediate, then `make check` to verify. See the [`make fix` announcement](/blog/2026/03/make-fix-and-mirror-automation/) for the full story.
 
 **`make release VERSION=x.y.z`** automates the release process. It validates the version format, ensures the working tree is clean, creates a signed git tag, and pushes it to trigger the build pipeline. The tag push fires the existing GitHub Actions workflow that builds, signs, and publishes the container image.