nido-core 0.0.0-alpha.0

Pre-release metadata crate. Real Nido core types and traits ship at >=0.1.0.
Documentation 
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## Summary

<!-- One-paragraph description of what this PR does and why. -->

## Type of change

- [ ] `feat` -- new user-facing feature
- [ ] `fix` -- bug fix
- [ ] `docs` -- documentation only
- [ ] `refactor` -- code restructuring, no behavior change
- [ ] `chore` -- dependency bump, build config, CI
- [ ] `BREAKING CHANGE` -- incompatible API change (pre-1.0 allowed via `feat!:` or footer)

## Testing

<!-- How did you test this? `cargo test --workspace`, manual TUI checks, etc. -->

- [ ] `cargo test --workspace` passes locally
- [ ] `cargo clippy --workspace --all-targets -- -D warnings` clean
- [ ] `cargo fmt --all --check` clean
- [ ] `lefthook run pre-commit` clean (gitleaks + ripsecrets + fmt + clippy)

## DCO sign-off

- [ ] Every commit is signed off with `Signed-off-by: Name <email>` (`git commit -s`)

## AI-agent disclosure

- [ ] If any commit was authored by an AI agent, a human contributor has
      reviewed the diff and verified the testing claims

## Related issues

<!-- Closes #123, refs #456 -->