Switch ideas workflows to Gemini CLI with web search

[strawgate]

Summary

• Switches all 5 ideas-man workflows from Copilot (product-manager-impersonator) to Gemini CLI with web search (internal-gemini-cli-web-search)
• Embeds the full product-manager-impersonator ideation methodology into each workflow's additional-instructions, adapted for the Gemini web search agent
• Updates deep-research.yml to use the renamed reusable workflow
• Updates ideas workflows permissions to include actions: read, discussions: write, and pull-requests: write

What changed in each workflow

Each ideas workflow now has a rich 6-step prompt:

1. Understand where we are — read README, docs, source files
2. Understand where we're going — review recent issues, PRs, commits
3. Research with web search — find inspiration from blog posts, community discussions, emerging patterns
4. Pick three, keep one — generate 3 candidates from different angles, select the best
5. Check for duplicates — search existing issues before filing
6. File or noop — only file genuinely useful ideas; call noop if nothing passes the bar

Domain-specific personas

Workflow	Persona	Research focus
iterative-ideas-man	Product-minded engineer	General ecosystem patterns
medium-ideas-man	Product-minded engineer	Product roadmaps, UX patterns
security-ideas-man	Threat-hunter / SOC engineer	CVE trends, MITRE ATT&CK, detection engineering
observability-ideas-man	SRE / platform engineer	OpenTelemetry specs, SRE blogs
vector-search-ideas-man	Search engineer / AI builder	HNSW/IVF developments, embedding models, hybrid retrieval

Issue format

All ideas include structured sections: Summary, Why a User Would Want This, Why It Won't Be That Hard, Research (with links), and Evidence (repo references). Small ideas use Rough Implementation Sketch; medium ideas use Proposed UX + Technical Approach and also include Estimated Effort and Risks/Open Questions.

Test plan

• Trigger each workflow manually via workflow_dispatch and verify it produces a well-structured issue
• Verify noop works when no good ideas are found
• Confirm no YAML syntax errors (all files validated)

🤖 Generated with [Claude Code]((claude.com/redacted)

Generated by Update PR Body for issue #896

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📥 Commits

Reviewing files that changed from the base of the PR and between 6964b8f and c87d235.

📒 Files selected for processing (6)

• .github/workflows/deep-research.yml
• .github/workflows/iterative-ideas-man.yml
• .github/workflows/medium-ideas-man.yml
• .github/workflows/observability-ideas-man.yml
• .github/workflows/security-ideas-man.yml
• .github/workflows/vector-search-ideas-man.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/gemini-ideas-workflows

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