fix: prefix agent filename with ado to distinguish from gh-aw

[jamesadevine]

Renames the init agent file from ado-aw.agent.md to ado.ado-aw.agent.md so it is clearly distinct from gh-aw agent files that share the same .github/agents/ directory.

[github-actions]

🔍 Rust PR Review

Summary: Looks good — clean, well-scoped rename with no missed references.

Findings

✅ What Looks Good

• All five reference sites updated atomically: src/init.rs constant, AGENTS.md, README.md, and both integration test assertions in tests/init_tests.rs. No stale references to ado-aw.agent.md remain in the codebase.
• detect.rs (which scans repos for compiled pipelines) correctly operates on the # @ado-aw source= header comment in YAML files, not on the init-agent filename — so it needs no changes.
• src/data/init-agent.md (the template deployed to consumer repos by init) uses versioned v{{ compiler_version }} URLs, which is correct and unaffected by this rename.
• The repo's own .github/agents/ado-agentic-workflows.agent.md uses main-branch URLs, appropriate for internal contributor use as opposed to the versioned template.
• Separation of the repo's ado-aw and gh-aw dispatcher agents into distinct files (ado-agentic-workflows.agent.md vs. agentic-workflows.agent.md) is a sensible organisational improvement.

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