chore(toolchain): upgrade to Go 1.27

README.md

@@ -90,8 +90,8 @@ cross-compiles the same four targets.
 | `cmd/gasm` | The `gasm` binary tying it all together. |
 | `_gen` | The generator that rebuilds the instruction tables from the Go toolchain. |
 
-See [`docs/architecture.md`](docs/architecture.md) for the design rationale and
-data flow, and [`docs/decisions.md`](docs/decisions.md) for design decisions
+See [`docs/ARCHITECTURE.md`](docs/ARCHITECTURE.md) for the design rationale and
+data flow, and [`docs/DECISIONS.md`](docs/DECISIONS.md) for design decisions
 deliberately postponed (with the analysis needed to pick them up again).
 
 ## Quick start
@@ -126,8 +126,8 @@ gasm profile k.s                     # show basic-block structure
 ```
 
 See [CONTRIBUTING.md](CONTRIBUTING.md) for the full development workflow,
-[docs/cli.md](docs/cli.md) for the command reference, and
-[docs/development.md](docs/development.md) for setup and recipes.
+[docs/CLI.md](docs/CLI.md) for the command reference, and
+[docs/DEVELOPMENT.md](docs/DEVELOPMENT.md) for setup and recipes.
 
 ## Editor integration