[INJECT-05] Expose the idiomatic Zig SQLi API

Objective

Expose one-shot detection, reusable parser state, token iteration, fingerprints, custom tables, explicit errors, and caller-provided buffers without hidden allocation.

Deliverables

• Implement the complete scoped behavior without Git submodules.
• Keep public APIs explicit about ownership, resource limits, and errors.
• Add focused unit, integration, compatibility, fuzz, and benchmark coverage as applicable.
• Update documentation and machine-readable compatibility status.

Acceptance criteria

• The scoped implementation and tests are merged on main.
• Zig formatting, focused tests, and the repository CI suite pass.
• No unexplained compatibility skips, silent fallbacks, leaks, or unbounded hostile-input paths remain.
• Benchmarks or security evidence is attached when this affects a hot or untrusted path.

Relationships

• Parent: INJECT-00

Blocked by

• INJECT-03
• INJECT-04

Blocks

• INJECT-08
• INJECT-09
• INJECT-10

Baselines

• Zig 0.17-dev resolved and locked through Pantry.
• ModSecurity 3.0.16, Coraza 3.7.0, CRS 4.28.0, and libinjection 4.0.0 where applicable.

Initial native API slice: 239232e exposes reusable caller-owned state, allocation-free detection, explicit confidence/reason/truncation, fingerprints, and leading-quote context handling. CI passed: https://github.com/zig-utils/zig-injection/actions/runs/29892895301. The issue remains open until full compatibility semantics are proven.