Add "assign to Copilot" as an implementation option in chaining docs

[strawgate]

Summary

• Adds a new "Detector creates issue -> assign to Copilot" section in docs/workflows/detector-fixer-chaining.md, including a workflow example that assigns detector-created issues with gh issue edit --add-assignee @copilot``.
• Documents that the handoff job only needs issues: write; COPILOT_GITHUB_TOKEN remains in the detector job in the example.
• Updates docs/index.md onboarding with explicit core-workflow install commands, refreshed workflow grouping, and collapsible install tips for maintenance workflow sets.
• Updates install snippets across workflow docs to use curl -fsSL (replacing curl -sL), plus wording updates in docs/workflows/gh-agent-workflows.md.
• Enables MkDocs rendering for collapsible tips by adding pymdownx.details and pymdownx.superfences in mkdocs.yml.

Test plan

• Verify docs render correctly (including collapsible ??? tip blocks)
• Spot-check copied install commands for core and maintenance workflow sections

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The body of this PR is automatically managed by the Trigger Update PR Body workflow.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c6274520-4acc-4b36-b35e-4fe43bf01799

📥 Commits

Reviewing files that changed from the base of the PR and between 5ff4e1f and 457cf92.

📒 Files selected for processing (10)

• docs/index.md
• docs/workflows/detector-fixer-chaining.md
• docs/workflows/gh-agent-workflows.md
• docs/workflows/gh-agent-workflows/bugs.md
• docs/workflows/gh-agent-workflows/code-duplication.md
• docs/workflows/gh-agent-workflows/docs-patrol-overview.md
• docs/workflows/gh-agent-workflows/newbie-contributor.md
• docs/workflows/gh-agent-workflows/stale-issues.md
• docs/workflows/gh-agent-workflows/test-coverage.md
• docs/workflows/gh-agent-workflows/text-quality.md

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/workflows/gh-agent-workflows.md

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📝 Walkthrough

Walkthrough

Adds documentation for a new workflow pattern "Detector creates issue → assign to Copilot" by introducing an assign-to-copilot job that runs after detect, requires created_issue_number, and performs an API call to assign the created issue to Copilot. Updates docs/index.md with expanded get-started steps, multiple curl-based installer tips that write example workflow YAML into .github/workflows, expands the Core workflows list and descriptive text, and enables pymdownx.details and pymdownx.superfences in mkdocs.yml. Several installer curl examples were changed from -sL to -fsSL.

Possibly related PRs

• Update actions permissions #400: Touches Copilot handoff flow and COPILOT_GITHUB_TOKEN usage and permissions, directly related to the new assign-to-copilot job.
• Reorganize workflow docs nav and update landing page #595: Overlapping documentation edits to the site landing/navigation and detector/fixer workflow content, affecting the same docs files.
• docs: surface quick setup script in the Quick Start section #433: Updates Quick Start/quick-setup content in docs/index.md and promotes the quick-setup script, overlapping the install-first snippets added here.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/copilot-assign-option

• 🛠️ Update Documentation: Commit on current branch
• 🛠️ Update Documentation: Create PR

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

♻️ Duplicate comments (1)

docs/index.md (1)

25-34: ⚠️ Potential issue | 🔴 Critical

curl -sL writes error pages into workflow files on HTTP failures.

Lines 25-34, 78-83, and 106-115 use curl -sL, which exits successfully even on 404/500 responses, writing error HTML into .github/workflows/*.yml. Users end up with broken workflows.

Replace all with curl -fsSL to fail fast on HTTP errors.

🔧 Fix for all curl commands

-curl -sL https://raw.githubusercontent.com/elastic/ai-github-actions/v0/gh-agent-workflows/issue-triage/example.yml \
+curl -fsSL https://raw.githubusercontent.com/elastic/ai-github-actions/v0/gh-agent-workflows/issue-triage/example.yml \

Apply the same -sL → -fsSL change to all remaining curl commands in lines 27-34, 78-83, and 106-115.

Also applies to: 78-83, 106-115

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@docs/index.md` around lines 25 - 34, Replace the curl flags that allow silent
success on HTTP errors: change every occurrence of "curl -sL" to "curl -fsSL" in
the shown commands so curl fails on 4xx/5xx and does not write error HTML into
workflow files (update the curl invocations that produce
.github/workflows/trigger-issue-triage.yml, trigger-mention-in-issue.yml,
trigger-mention-in-pr.yml, trigger-pr-review.yml,
trigger-pr-actions-detective.yml and the other curl lines referenced in the
comment).

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Duplicate comments:
In `@docs/index.md`:
- Around line 25-34: Replace the curl flags that allow silent success on HTTP
errors: change every occurrence of "curl -sL" to "curl -fsSL" in the shown
commands so curl fails on 4xx/5xx and does not write error HTML into workflow
files (update the curl invocations that produce
.github/workflows/trigger-issue-triage.yml, trigger-mention-in-issue.yml,
trigger-mention-in-pr.yml, trigger-pr-review.yml,
trigger-pr-actions-detective.yml and the other curl lines referenced in the
comment).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7c9c0fa1-cfc9-4f9a-ac7a-003a28844b08

📥 Commits

Reviewing files that changed from the base of the PR and between 3b582d2 and 5ff4e1f.

📒 Files selected for processing (2)

• docs/index.md
• docs/workflows/gh-agent-workflows.md