Port over ember-template-lint rule for gjs/gts

Revert .github changes

Remove attribute indentation rule. We have prettier for formatting concerns

Port over gjs/gts relevant ember-template-lint

cleanup

Add documentation and test files for removed ember rules

feat(rules): add template-require-valid-form-groups and template-template-length rules

- Introduced `template-require-valid-form-groups` rule to enforce proper grouping of form controls using `<fieldset>`/`<legend>` or WAI-ARIA roles.
- Added `template-template-length` rule to enforce size constraints on templates, allowing configuration for minimum and maximum line lengths.
- Updated documentation for existing rules to include configuration details.
- Added tests for both new rules to ensure correct functionality and error reporting.

Cleanup

Fix

Author: Copilot

.gitignore

@@ -14,3 +14,4 @@ npm-debug.log
 
 # eslint-remote-tester
 eslint-remote-tester-results
+package-lock.json

CHANGELOG.md

@@ -0,0 +1,39 @@
+# ember/template-deprecated-inline-view-helper
+
+<!-- end auto-generated rule header -->
+
+✅ The `extends: 'recommended'` property in a configuration file enables this rule.
+
+In Ember 1.12, support for invoking the inline View helper was deprecated.
+
+## Examples
+
+This rule **forbids** the following:
+
+```hbs
+{{view 'this-is-bad'}}
+
+{{view.also-bad}}
+
+{{qux-qaz please=view.stop}}
+
+{{#not-this please=view.stop}}{{/not-this}}
+
+<div foo={{view.bar}}></div>
+```
+
+This rule **allows** the following:
+
+```hbs
+{{this-is-better}}
+
+{{qux-qaz this=good}}
+
+{{#ok-this yay=nice}}{{/ok-this}}
+
+<div foo={{bar}}></div>
+```
+
+## References
+
+- More information is available at the [Deprecation Guide](http://emberjs.com/deprecations/v1.x/#toc_ember-view).

README.md

@@ -0,0 +1,23 @@
+# ember/template-deprecated-render-helper
+
+<!-- end auto-generated rule header -->
+
+Disallows the {{render}} helper which is deprecated.
+
+## Examples
+
+Incorrect:
+
+```gjs
+<template>{{render "user"}}</template>
+```
+
+Correct:
+
+```gjs
+<template><User /></template>
+```
+
+## References
+
+- [ember-template-lint deprecated-render-helper](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/deprecated-render-helper.md)

docs/rules/template-deprecated-inline-view-helper.md

@@ -0,0 +1,47 @@
+# ember/template-modifier-name-case
+
+🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
+
+<!-- end auto-generated rule header -->
+
+Requires dasherized names for modifiers.
+
+Modifiers should use dasherized names when being invoked, not camelCase. This is a stylistic rule that will prevent you from using camelCase modifiers, requiring you to use dasherized modifier names instead.
+
+## Examples
+
+This rule **forbids** the following:
+
+```hbs
+<div {{didInsert}}></div>
+```
+
+```hbs
+<div {{onFocus}}></div>
+```
+
+```hbs
+<div {{modifier 'didInsert'}}></div>
+```
+
+This rule **allows** the following:
+
+```hbs
+<div {{did-insert}}></div>
+```
+
+```hbs
+<div {{on-focus}}></div>
+```
+
+```hbs
+<div {{modifier 'did-insert'}}></div>
+```
+
+## See Also
+
+- [named-functions-in-promises](named-functions-in-promises.md)
+
+## References
+
+- [Template syntax guide - Modifiers](https://guides.emberjs.com/release/components/template-syntax/#toc_modifiers)

docs/rules/template-deprecated-render-helper.md

@@ -0,0 +1,64 @@
+# ember/template-no-action-modifiers
+
+<!-- end auto-generated rule header -->
+
+💼 This rule is enabled in the following [configs](https://github.com/ember-cli/eslint-plugin-ember#-configurations): `strict-gjs`, `strict-gts`.
+
+Disallow usage of `{{action}}` modifiers in templates.
+
+The `{{action}}` modifier has been deprecated in favor of the `{{on}}` modifier. The `{{on}}` modifier provides a more explicit and flexible way to handle events.
+
+## Rule Details
+
+This rule disallows using `{{action}}` as an element modifier.
+
+## Examples
+
+### Incorrect ❌
+
+```gjs
+<template>
+  <button {{action "save"}}>Save</button>
+</template>
+```
+
+```gjs
+<template>
+  <div {{action "onClick"}}>Click me</div>
+</template>
+```
+
+```gjs
+<template>
+  <form {{action "submit" on="submit"}}>Submit</form>
+</template>
+```
+
+### Correct ✅
+
+```gjs
+<template>
+  <button {{on "click" this.handleClick}}>Save</button>
+</template>
+```
+
+```gjs
+<template>
+  <div {{on "click" this.onClick}}>Click me</div>
+</template>
+```
+
+```gjs
+<template>
+  <form {{on "submit" this.handleSubmit}}>Submit</form>
+</template>
+```
+
+## Related Rules
+
+- [template-no-action](./template-no-action.md)
+
+## References
+
+- [Ember Octane Guide - Element Modifiers](https://guides.emberjs.com/release/components/template-lifecycle-dom-and-modifiers/)
+- [ember-template-lint: no-action](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-action.md)

docs/rules/template-modifier-name-case.md

@@ -0,0 +1,65 @@
+# ember/template-no-action-on-submit-button
+
+<!-- end auto-generated rule header -->
+
+💼 This rule is enabled in the following [configs](https://github.com/ember-cli/eslint-plugin-ember#-configurations): `strict-gjs`, `strict-gts`.
+
+Disallow `action` attribute on submit buttons.
+
+Using the `action` attribute on submit buttons is a common mistake. Instead, you should use the `{{on}}` modifier to handle click events, or handle form submission at the form level.
+
+## Rule Details
+
+This rule disallows using the `action` attribute on `<button>` elements (which default to type="submit") and `<input type="submit">` elements.
+
+## Examples
+
+### Incorrect ❌
+
+```gjs
+<template>
+  <button action="save">Save</button>
+</template>
+```
+
+```gjs
+<template>
+  <button type="submit" action="submit">Submit</button>
+</template>
+```
+
+```gjs
+<template>
+  <input type="submit" action="go" />
+</template>
+```
+
+### Correct ✅
+
+```gjs
+<template>
+  <button {{on "click" this.handleClick}}>Save</button>
+</template>
+```
+
+```gjs
+<template>
+  <button type="button" action="doSomething">Click</button>
+</template>
+```
+
+```gjs
+<template>
+  <form {{on "submit" this.handleSubmit}}>
+    <button type="submit">Submit</button>
+  </form>
+</template>
+```
+
+## Related Rules
+
+- [template-no-action-modifiers](./template-no-action-modifiers.md)
+
+## References
+
+- [ember-template-lint: no-invalid-interactive](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-invalid-interactive.md)

docs/rules/template-no-action-modifiers.md

@@ -0,0 +1,54 @@
+# ember/template-no-action
+
+<!-- end auto-generated rule header -->
+
+Disallows the use of `{{action}}` helper.
+
+The `{{action}}` helper is deprecated in favor of the `{{on}}` modifier and `{{fn}}` helper, which provide better performance and clearer intent.
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  <button {{on "click" (action "save")}}>Save</button>
+</template>
+```
+
+```gjs
+<template>
+  {{action "doSomething"}}
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <button {{on "click" this.save}}>Save</button>
+</template>
+```
+
+```gjs
+<template>
+  <button {{on "click" (fn this.save "arg")}}>Save with arg</button>
+</template>
+```
+
+```gjs
+<template>
+  {{this.action}}
+</template>
+```
+
+## Migration
+
+- Replace `(action "methodName")` with method references or `(fn this.methodName)`
+- Replace `<button onclick={{action ...}}>` with `<button {{on "click" ...}}>`
+
+## References
+
+- [ember-template-lint no-action](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-action.md)
+- [Ember.js Deprecations - action helper](https://deprecations.emberjs.com/v3.x/#toc_action-helper)
+- [Ember Modifier Documentation](https://guides.emberjs.com/release/components/template-lifecycle-dom-and-modifiers/)

docs/rules/template-no-action-on-submit-button.md

@@ -0,0 +1,49 @@
+# ember/template-no-ambiguous-glimmer-paths
+
+<!-- end auto-generated rule header -->
+
+> Disallow ambiguous path in templates
+
+## Rule Details
+
+This rule requires explicit `this.` or `@` prefix for property access to avoid ambiguity.
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  {{user.name}}
+</template>
+```
+
+```gjs
+<template>
+  {{model.title}}
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  {{this.user.name}}
+</template>
+```
+
+```gjs
+<template>
+  {{@model.title}}
+</template>
+```
+
+```gjs
+<template>
+  {{MyComponent}}
+</template>
+```
+
+## References
+
+- [ember-template-lint no-implicit-this](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-implicit-this.md)