chore: remove internal automation artifacts

[AlainDor]

Summary:

• Remove internal automation/control files from the public repo tree.
• Keep local tooling and orchestration files ignored so they are not reintroduced.
• Remove public references to deleted automation manuals and the deleted test coupling.

Verification:

• git diff --check
• cargo fmt --all -- --check
• cargo test --workspace
• cargo clippy --all-targets --all-features -- -D warnings
• git ls-tree -r --name-only HEAD | rg '(^|/)(.agents|.claude)(/|$)|(^|/)(AGENTS|CLAUDE|WORKFLOW).md$' returned no matches
• rg 'AGENTS.md|CLAUDE.md|WORKFLOW.md|operating manual|Where to Look|agents_md_table|auto-ingested' returned no matches
• GitHub Actions passed: fmt, deny, clippy matrix, test matrix

Risk:

• No product source changes.