Clean up scope bag, wire format, and debug render tree

[NullVoxPopuli-ai-agent]

Summary

Follow-up cleanup now that the scope bag is a Record<string, unknown> (#21224). Two commits:

1. Remove lexicalSymbols from wire format and dead debugSymbols codepath

Lexical symbol names are now always available via Object.keys(scope()), making two things redundant:

• The optional lexicalSymbols slot in SerializedTemplateBlock
• The emit.debugSymbols option — removed from the compiler, PrecompileOptionsWithLexicalScope type, test helpers (defComponent, createTemplate), and all test callsites

2. Remove template field from debug render tree

The name field already identifies components in the render tree (now reliably, thanks to the object-based scope bag). The template field (module name of the backing .hbs file) provided no useful information beyond what name gives, so it's removed from RenderNode, CapturedRenderNode, and all producers/consumers.

This deletes the moduleName resolution logic from the component opcode, templateName from route-template definition state, and the template parameter from getDebugCustomRenderTree.

Files changed

Area	Files	Change
Wire format	@glimmer/interfaces (wire-format)	Removed lexicalSymbols from SerializedTemplateBlock
Compiler	@glimmer/compiler	Removed block.push(usedLocals) debug symbols emission
Opcode compiler	@glimmer/opcode-compiler (shared.ts)	meta() derives lexical from scope object keys
Syntax	@glimmer/syntax	Removed emit.debugSymbols from types
Render tree types	@glimmer/interfaces (debug-render-tree, component manager)	Removed template from RenderNode, CapturedRenderNode, getDebugCustomRenderTree
Render tree impl	@glimmer/runtime (debug-render-tree, component opcode)	Removed captureTemplate, moduleName resolution
Ember managers	route-template, outlet, mount	Removed template/templateName fields
Test helpers	defComponent, createTemplate, defineComponent	Removed emit/moduleName/debugSymbols options
Tests	Both debug-render-tree test files	Removed ~190 template: assertion lines

Test plan

• All 9138 tests pass (0 failures, 14 pre-existing skips)
• Type checking passes (only pre-existing unrelated errors)

🤖 Generated with Claude Code

[ef4]

Only concern is making sure that we aren't causing a regression here for inspector behavior for non-strict handlebars.

[NullVoxPopuli]

https://github.com/ember-learn/ember-api-docs/pull/1007

[NullVoxPopuli]

hbs only works