Implement scene file syntax checker (チェッカーの実装)

[Copilot]

Scene files had no parse-time validation — structural violations like <item> outside <choice> or duplicate <scenario> sections were silently accepted, only failing at runtime.

New: parser/checker.js

Recursive validator that enforces parent-child constraints on the parsed scenario tree using a TOP_LEVEL_COMMANDS constant (derived from Core.commandList in core/index.js) and an ALLOWED_PARENTS map:

Node	Required parent
<item>	<choice>
<action>	<actions>
<then>	<if> or any top-level command (HTTP response context)
<else>	<if>
<prompt> / <actions>	<dialog>
<color> / <ruby> / <b> / <i> / <br>	<text> or <say>
<header> / <data> / <error> / <progress>	any top-level command

Inline text decoration tags (color, ruby, b, i, br) are sourced from drawer.ts's createDecoratedElement and textHandler. HTTP sub-tags (header, data, error, progress) are sourced from httpHandler and are valid inside any top-level command since HTTP is a global feature.

Returns an array of { type, node, parent, message } error objects.

Updated: parser/parser.js

• Detects multiple <scenario> sections per file
• Runs the checker post-parse; includes errors in return value

Updated: parser/cli.js

• Prints errors to stderr with filename context; exits 1 on any error

Syntax Error in choice.scene: <item> must be inside <choice>, but found inside scenario root

New: parser/checker.test.ts

24 unit tests covering valid structures (no false positives) and all enforced parent-child violations, including inline text decoration and HTTP sub-tag rules.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>チェッカーの実装</issue_title>
<issue_description>Scenarioが二つある。

itemは、choiceの中だけなど、構文チェッカーを実装する

---

Trelloから移行 (todo): https://trello.com/c/5vlGqqjj</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes チェッカーの実装 #110

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Project	Deployment	Actions	Updated (UTC)
webtalekit-demo	Error		Mar 20, 2026 1:04pm

[EndoHizumi]

@copilot 他のタグのバリエーションもcore.jsを参照して、追加して

[Copilot]

@copilot 他のタグのバリエーションもcore.jsを参照して、追加して

Added all tag variations from core/index.js and drawer.ts in commit ff1a4fc:

• Inline text decoration (color, ruby, b, i, br) — must be inside <text> or <say> (from createDecoratedElement in drawer.ts and textHandler)
• HTTP sub-tags (header, data, error, progress) — must be inside any top-level command; cannot appear at scenario root (HTTP is a global feature usable on all commands)
• then — expanded to allow both <if> children and HTTP response children inside any top-level command

A TOP_LEVEL_COMMANDS constant was extracted from Core.commandList to keep the definitions DRY. 10 new tests were added covering all the new rules (24 total).