fix: add language labels to fenced code blocks for MD040 compliance

Add `text` language identifier to unlabeled fenced code blocks
to satisfy markdownlint MD040 rule across Go documentation files.

agents/go-build-resolver.md

@@ -125,7 +125,7 @@ go list -f '{{.ImportPath}} -> {{.Imports}}' ./...
 - Use interfaces to break the cycle
 - Restructure package dependencies
 
-```
+```text
 # Before (cycle)
 package/a -> package/b -> package/a
 
@@ -305,7 +305,7 @@ x = x  // Remove pointless assignment
 
 ## Resolution Workflow
 
-```
+```text
 1. go build ./...
    ↓ Error?
 2. Parse error message
@@ -340,7 +340,7 @@ Stop and report if:
 
 After each fix attempt:
 
-```
+```text
 [FIXED] internal/handler/user.go:42
 Error: undefined: UserService
 Fix: Added import "project/internal/service"
@@ -349,7 +349,7 @@ Remaining errors: 3
 ```
 
 Final summary:
-```
+```text
 Build Status: SUCCESS/FAILED
 Errors Fixed: N
 Vet Warnings Fixed: N

agents/go-reviewer.md

@@ -224,7 +224,7 @@ When invoked:
 ## Review Output Format
 
 For each issue:
-```
+```text
 [CRITICAL] SQL Injection vulnerability
 File: internal/repository/user.go:42
 Issue: User input directly concatenated into SQL query

commands/go-build.md

@@ -43,7 +43,7 @@ go mod tidy -v
 
 ## Example Session
 
-```
+```text
 User: /go-build
 
 Agent:

commands/go-review.md

@@ -68,7 +68,7 @@ govulncheck ./...
 
 ## Example Usage
 
-```
+```text
 User: /go-review
 
 Agent:

commands/go-test.md

@@ -35,7 +35,7 @@ REPEAT  → Next test case
 
 ## Example Session
 
-```
+```text
 User: /go-test I need a function to validate email addresses
 
 Agent:

skills/golang-patterns/SKILL.md

@@ -364,7 +364,7 @@ func WriteAndFlush(w io.Writer, data []byte) error {
 
 ### Standard Project Layout
 
-```
+```text
 myproject/
 ├── cmd/
 │   └── myapp/