add check subcommand and update READMEs

Add a CLI `check` subcommand that runs the same diagnostic pipeline as the LSP server and outputs errors to stdout, enabling CI/CD pipelines, pre-commit hooks, and AI agents to lint Go templates without running an editor.

Supports text output (file:line:col: message) and structured JSON output (-json flag). Exit codes: 0 = clean, 1 = errors found, 2 = tool failure.

Update both go-template-lsp and gozer READMEs to document all available features including the new check subcommand, formatting with attribute wrapping, document links, and custom function discovery.

Author: Jason-Abbott

.beans/.sync.json

@@ -7,6 +7,12 @@
         "synced_at": "2026-02-01T19:29:29.915237Z"
       }
     },
+    "golsp-909x": {
+      "clickup": {
+        "task_id": "868hdq2ky",
+        "synced_at": "2026-02-08T16:33:17.888637Z"
+      }
+    },
     "golsp-9w5l": {
       "clickup": {
         "task_id": "868hba6g9",
@@ -61,6 +67,12 @@
         "synced_at": "2026-02-02T04:04:50.009521Z"
       }
     },
+    "golsp-k9kf": {
+      "clickup": {
+        "task_id": "868hdq2kx",
+        "synced_at": "2026-02-08T16:33:17.589069Z"
+      }
+    },
     "golsp-lteb": {
       "clickup": {
         "task_id": "868ham023",

.beans/golsp-ru6k--update-readmes-for-check-subcommand.md

@@ -0,0 +1,11 @@
+---
+# golsp-ru6k
+title: Update READMEs for check subcommand
+status: completed
+type: task
+priority: normal
+created_at: 2026-02-08T16:34:02Z
+updated_at: 2026-02-08T16:35:15Z
+---
+
+Update go-template-lsp README and gozer README to document the new check subcommand and ensure all features are listed.

README.md

@@ -4,13 +4,16 @@ A Language Server Protocol (LSP) implementation for Go templates (`text/template
 
 ## Features
 
-- **Diagnostics**: Real-time syntax error detection as you type
+- **Diagnostics**: Real-time syntax error detection and semantic analysis (undefined variables, missing fields, unknown functions)
 - **Hover**: Type information and documentation on hover over template variables and functions
 - **Go to Definition**: Navigate to template definitions (`{{define "name"}}`)
 - **Formatting**: Re-indent based on HTML and template nesting, with optional attribute wrapping
 - **Folding Ranges**: Collapse template blocks (`{{if}}...{{end}}`, `{{range}}...{{end}}`) and comments
-- **Semantic Tokens**: Enhanced syntax highlighting
-- **Document Highlight**: Highlight matching template keywords
+- **Semantic Tokens**: Enhanced syntax highlighting for keywords, variables, functions, strings, numbers, and operators
+- **Document Highlight**: Highlight matching template keywords (e.g. click `{{if}}` to highlight its `{{else}}` and `{{end}}`)
+- **Document Links**: Clickable links in template documents
+- **Custom Function Discovery**: Automatically scans Go source files for `template.FuncMap` definitions so custom functions are recognized
+- **CLI Linting**: `check` subcommand for CI/CD and command-line diagnostics
 
 ## Installation
 
@@ -112,6 +115,50 @@ When an HTML opening tag exceeds a configured line width, the formatter can wrap
 
 Continuation lines are indented one level deeper than the tag. Multi-line tags already in the source are joined back into a single line before re-wrapping.
 
+## CLI Linting (`check`)
+
+The `check` subcommand runs the same diagnostic pipeline as the LSP server and prints errors to stdout. This is useful for CI/CD pipelines, pre-commit hooks, and AI agents.
+
+```bash
+# Check the current directory
+go-template-lsp check
+
+# Check a specific directory
+go-template-lsp check ./views
+
+# JSON output
+go-template-lsp check -json ./views
+```
+
+**Text output** (default):
+
+```
+views/user.html:8:22: missing matching '{{ end }}' statement
+```
+
+**JSON output** (`-json`):
+
+```json
+[
+  {
+    "file": "views/user.html",
+    "line": 8,
+    "column": 22,
+    "endLine": 8,
+    "endColumn": 24,
+    "message": "missing matching '{{ end }}' statement"
+  }
+]
+```
+
+**Exit codes:**
+
+| Code | Meaning |
+|------|---------|
+| `0` | No errors found |
+| `1` | Template errors found |
+| `2` | Tool failure (e.g. directory not found) |
+
 ## Supported File Extensions
 
 | Extension | Type |