[docs] docs: remove bloat from custom-safe-outputs reference page

[github-actions]

Removes documentation bloat from docs/src/content/docs/reference/custom-safe-outputs.md, reducing the file from 451 to 373 lines (~17% line reduction, ~25% prose word count reduction) while preserving all essential information.

Changes Made

1. Merged "When to Use" section into intro (−11 lines)
The 5-bullet "When to Use Custom Safe Outputs" section was redundant with the intro paragraph — both listed the same services and use cases. Consolidated to a single concise sentence.

2. Removed Step 1 "Define the MCP Server" (−23 lines)
Step 1 showed a standalone MCP server config block that was then repeated verbatim at the start of Step 2's full example. Since Step 2 already contained the complete setup, Step 1 was pure duplication. The two setup steps are now merged into one combined "Define the Shared Configuration" step.

3. Removed duplicate JavaScript "Accessing Agent Output" example (−30 lines)
The "Accessing Agent Output" section contained both a Bash and a JavaScript example. The JavaScript example (30 lines) duplicated the pattern already shown in the full Notion walkthrough example. Kept the Bash example and replaced the JavaScript section with a single explanatory sentence.

4. Condensed "Understanding inputs:" section (−7 lines)
The 8-line subsection explained that inputs: has two purposes (tool discovery + validation). This is captured in a single sentence appended to the Accessing Agent Output section.

5. Condensed "Staged Mode Support" (−8 lines)
Replaced an inline code example with a 1-line note linking to the Staged Mode reference page, which already has the complete example.

Screenshots

Screenshots could not be captured due to network isolation between the Playwright browser sandbox and the local preview server in this CI environment. The documentation page renders correctly when accessed via HTTP (verified with curl).

Blocked domains: None encountered (the issue was network isolation, not blocked external resources).

References: §22980144235

🗜️ Compressed by Documentation Unbloat · ◷

• expires on Mar 14, 2026, 12:13 AM UTC

[Copilot]

Pull request overview

Removes duplicated/verbose content from the Custom Safe Outputs reference while keeping the core guidance and examples intact.

Changes:

• Consolidates the “when to use” guidance into a shorter intro.
• Merges the MCP server + custom job setup into a single “shared configuration” step and renumbers subsequent steps.
• Removes redundant examples/sections (JS output-processing example, expanded inputs: explanation, and inline staged-mode code) in favor of shorter explanations and a link to the staged-mode reference.

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[Copilot]

The updated intro sentence is a bit misleading: custom safe outputs don’t really “extend built-in GitHub operations” so much as extend GitHub Agentic Workflows / built-in safe outputs to support third‑party write operations. Consider rephrasing to reference “built-in safe outputs” (issues/PRs/discussions) to avoid implying this is a GitHub-native feature set being extended.

Suggested change

	Custom safe outputs extend built-in GitHub operations to integrate with third-party services — Slack, Discord, Notion, Jira, databases, or any external API requiring authentication. Use them for any write operation that built-in safe outputs don't cover.
	Custom safe outputs extend GitHub Agentic Workflows' built-in safe outputs (issues, pull requests, discussions) to support third-party services — Slack, Discord, Notion, Jira, databases, or any external API requiring authentication. Use them for any write operation that built-in safe outputs don't cover.

[Copilot]

This reads like the environment variable’s value literally includes a JavaScript comparison (=== 'true'). For language-agnostic docs, it’s clearer/accurate to say something like “When GH_AW_SAFE_OUTPUTS_STAGED is set to 'true'…” (the comparison operator is part of your code, not the variable).

Suggested change

	When `GH_AW_SAFE_OUTPUTS_STAGED === 'true'`, skip the real operation and display a preview using `core.summary`. See [Staged Mode](/gh-aw/reference/staged-mode/#staged-mode-for-custom-safe-output-jobs) for a complete example.
	When `GH_AW_SAFE_OUTPUTS_STAGED` is set to `'true'`, skip the real operation and display a preview using `core.summary`. See [Staged Mode](/gh-aw/reference/staged-mode/#staged-mode-for-custom-safe-output-jobs) for a complete example.