docs: add Agent.md guide for AI doc contributions

Author: lyzhang0113

Agent.md

@@ -0,0 +1,117 @@
+# Agent.md
+
+Guidelines for AI assistants that create or update documentation in this repository.
+
+## Scope and Intent
+
+- Repository: `dynamsoft-docs/web-twain-docs`
+- Product: Dynamic Web TWAIN documentation
+- Primary goal: produce accurate, consistent Markdown docs that match existing repo conventions.
+- Keep changes focused. Do not mix docs updates with local tooling/script changes unless explicitly requested.
+
+## Branching and PR Base
+
+- For normal docs work, branch from `preview` unless a different base is explicitly requested.
+- Keep each PR focused on one topic (for example: one FAQ issue, one API clarification, one guide update).
+- Avoid unrelated edits, formatting-only churn, and broad timestamp sweeps.
+
+## File Placement
+
+- FAQ pages live in `_articles/faq/`.
+- General guides live in `_articles/general-usage/` or `_articles/extended-usage/`.
+- API reference pages live in `_articles/info/api/`.
+- When adding a new FAQ, also update `_articles/faq/index.md`.
+
+## Frontmatter Rules
+
+Use existing files in the same folder as the source of truth.
+
+### FAQ page template
+
+```yaml
+---
+layout: default-layout
+noTitleIndex: true
+needAutoGenerateSidebar: true
+title: <question>
+keywords: Dynamic Web TWAIN, <topic keywords>
+breadcrumbText: <same as title>
+description: <same as title, or concise variant>
+date: YYYY-MM-DD HH:mm:ss +0800
+last_modified: YYYY-MM-DD HH:mm:ss +0800
+---
+```
+
+### Non-FAQ docs template (common)
+
+```yaml
+---
+layout: default-layout
+needAutoGenerateSidebar: true
+title: <page title>
+keywords: Dynamic Web TWAIN, <topic keywords>
+breadcrumbText: <short breadcrumb label>
+description: <concise summary>
+---
+```
+
+Notes:
+- `noTitleIndex` is common for FAQ and selected index-style pages; match nearby files.
+- If updating an existing FAQ, update `last_modified` to current edit time and keep the existing date format.
+- Keep timezone format consistent with the target file (many files use `+0800`; some newer files use `-08:00`).
+
+## FAQ Content Pattern
+
+For `_articles/faq/*.md`, match this structure:
+
+1. Category H1 (for example `# Addon`, `# Security`, `# Capture/Image Source`)
+2. Question H2 (`## ...?`)
+3. Direct answer first
+4. Steps or code sample if applicable
+5. Optional notes (`> [!NOTE]`) and related links
+
+Keep answers practical and implementation-oriented.
+
+## Writing Style
+
+- Be concise, technical, and specific.
+- Prefer product terminology already used in repo:
+  - `DWTObject`
+  - `LoadImage()` / `LoadImageEx()`
+  - `SetReaderOptions()`
+  - `OnPostLoad`
+- Do not introduce unsupported behavior claims.
+- Do not mention internal tickets, private case history, or customer-identifying details in public docs.
+
+## Linking and API References
+
+- Use internal absolute doc links like:
+  - `/_articles/info/api/WebTwain_IO.md#loadimageex`
+- Link API names to canonical API pages when mentioning methods/events.
+- Prefer existing anchor patterns used in nearby docs.
+- Keep external links to official pages only when necessary.
+
+## Code Snippet Rules
+
+- Use fenced code blocks with language tags (typically `javascript`, `html`, `bash`).
+- Keep snippets minimal but runnable.
+- Reuse existing coding style from surrounding docs:
+  - 4-space indentation in JS snippets is common.
+  - `DWTObject` naming is preferred in examples.
+
+## Safety and Accuracy Checks
+
+Before submitting changes:
+
+1. Verify every method/event name against `_articles/info/api/`.
+2. Verify error code/value statements against docs or validated support guidance.
+3. Ensure links resolve and anchors are valid.
+4. Ensure new FAQ is added to `_articles/faq/index.md` in the correct section.
+5. Ensure git diff includes only intended docs files.
+
+## Do Not Do
+
+- Do not edit local development scripts (`scripts/*.sh`, local-only files) for a docs-only task unless asked.
+- Do not reformat large unrelated sections.
+- Do not rename files casually; preserve existing URL paths.
+- Do not add AI/meta commentary into user-facing docs.