Remove root agent instruction files

[dceoy]

Summary

• remove repository-root AGENTS.md
• remove repository-root CLAUDE.md

Impact

• no runtime code changes
• nested agent instruction files are unchanged

Checks

• verified only repository-root instruction files are removed

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[claude]

Reviewed with code-quality, performance, test-coverage, documentation-accuracy, and security passes. The diff itself (deleting AGENTS.md and the CLAUDE.md symlink) is low-risk — no code, tests, or security-sensitive content are touched, and the env vars documented in AGENTS.md are still covered in README.md.

One general observation worth a second look before merging: the PR description says "nested agent instruction files are unchanged," which reads as implying the guidance is preserved elsewhere, but that's not quite accurate. The .agents/skills/*/SKILL.md files are per-skill invocation docs, not a substitute for repo-wide instructions. With this PR, the following guidance has no home anywhere else in the repo (no CONTRIBUTING.md exists):

• The root-level pointer to run .agents/skills/local-qa/scripts/qa.sh before committing/opening a PR (the script itself still exists, just nothing at the repo root references it anymore)
• Testing conventions (pytest.mark.parametrize, preferring mocked MT5/pdmt5 interactions)
• KISS/DRY/YAGNI design principles and commit/PR scoping guidelines

Not blocking, but worth confirming this is an intentional cleanup rather than an accidental loss of contributor guidance — otherwise consider migrating this content into README.md/CONTRIBUTING.md or keeping a thin root AGENTS.md that points to .agents/skills/.