build: upgrade Go version to 1.24 across build, CI, and docs

 - Update Dockerfile build stage to use Go 1.24
 - Update GitHub Actions CI workflow to setup Go 1.24
 - Update agent skills docs to reflect Go 1.24 dependency
 - Update AGENTS.md documentation review status tracking

Author: sudocarlos

.agents/skills/docker-ci/SKILL.md

@@ -19,12 +19,12 @@ docker buildx build -t sudocarlos/tailrelay:latest --load .
 ```
 
 `Dockerfile` stages:
-1. **webui-builder** (`golang:1.21-alpine`) — builds Go binary with ldflags
+1. **webui-builder** (`golang:1.24-alpine`) — builds Go binary with ldflags
 2. **main** (`tailscale/tailscale:v1.92.5`) — installs Caddy, socat, copies binary
 
 Key build args:
 - `TAILSCALE_VERSION` (default: `v1.92.5`)
-- `GO_VERSION` (default: `1.21`)
+- `GO_VERSION` (default: `1.24`)
 - `VERSION`, `COMMIT`, `DATE`, `BRANCH`, `BUILDER` — build metadata
 
 ### Development
@@ -157,5 +157,5 @@ Handles `SIGTERM`/`SIGINT` for graceful shutdown.
 |-----------|---------|
 | Container | `v0.4.1` (see `start.sh`) |
 | Tailscale base | `v1.92.5` (Dockerfile ARG) |
-| Go | `1.21` (Dockerfile ARG) |
+| Go | `1.24` (Dockerfile ARG) |
 | Node.js (CI) | `20` |

.agents/skills/webui/SKILL.md

@@ -191,4 +191,4 @@ go test ./internal/web/...
 - Handlers in `internal/handlers/`, business logic in `internal/*`
 - Explicit error handling; avoid panics for runtime conditions
 - Config types in `internal/config`
-- Dependencies: Go 1.21+, `gopkg.in/yaml.v3` (everything else is stdlib)
+- Dependencies: Go 1.24+, `gopkg.in/yaml.v3` (everything else is stdlib)

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.24'
           cache-dependency-path: webui/go.sum
 
       - name: Vet

AGENTS.md

@@ -113,8 +113,8 @@ curl -sSL http://localhost:8021            # Web UI
 | `AGENTS.md` | `17791f3` | `AGENTS.md`, `Makefile`, `start.sh` |
 | `.agents/skills/caddy/SKILL.md` | `17791f3` | `webui/internal/caddy/`, `webui/internal/handlers/caddy.go` |
 | `.agents/skills/socat/SKILL.md` | `17791f3` | `webui/internal/socat/`, `webui/internal/handlers/socat.go` |
-| `.agents/skills/webui/SKILL.md` | `17791f3` | `webui/`, `Makefile` |
-| `.agents/skills/docker-ci/SKILL.md` | `17791f3` | `Dockerfile`, `Dockerfile.dev`, `.github/workflows/`, `compose-test.yml` |
+| `.agents/skills/webui/SKILL.md` | `2c28a60` | `webui/`, `Makefile` |
+| `.agents/skills/docker-ci/SKILL.md` | `2c28a60` | `Dockerfile`, `Dockerfile.dev`, `.github/workflows/`, `compose-test.yml` |
 | `.agents/skills/tailscale/SKILL.md` | `17791f3` | `webui/internal/tailscale/`, `start.sh` |
 | `webui/README.md` | `17791f3` | `webui/` |
 | `README.md` | `17791f3` | `README.md`, `webui/internal/web/server.go` |

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 # check=skip=SecretsUsedInArgOrEnv
 ARG TAILSCALE_VERSION=v1.92.5
-ARG GO_VERSION=1.21
+ARG GO_VERSION=1.24
 ARG NODE_VERSION=22
 
 # Frontend build stage — Vite + Svelte + Tailwind