feat(oxc-reference): record TS7 boundary evidence

[swernerx]

Closes #20

Evidence

Runs the real TypeScript 7 Go tsfacts producer over all six representative corpus cases, consumes schema-v1 JSON Lines through the internal Rust boundary, attaches TypeFacts to OXC nodes with response-global fact indices, and performs bounded graph inspection.

The checked macOS arm64 spike record reports:

• 25 Go-oracle facts and 6,368 graph edges across 651 types, 556 declarations, 866 symbols, and 482 signatures.
• 22/22 facts mapped and attached for the five OXC-parseable files: 15 exact, 7 normalized, 0 unmapped, 0 ambiguous, and 0 actual-root transport mismatches.
• Three intentional syntax-recovery facts remain an explicit OXC consumer failure.
• 1,361 truncated entities, 7 error-state entities, 0 unsupported entities in the live corpus, and separately tested unsupported/unmapped diagnostic paths.
• Stable non-timing observations across both passes for every case.
• First/repeated aggregate one-shot time of 634,312,462 ns / 247,002,000 ns, a 13,425,232-byte debug consumer executable, and 11,829,248-byte peak RSS on the recorded host.

These timings are spike evidence, not general performance or warm-project-reuse claims.

Changes

• Add a one-command end-to-end evidence runner and deterministic machine-readable report.
• Preserve response-global fact indices when attaching project-wide snapshots file by file.
• Emit graph counts, sharing, budgets, timings, artifact/memory measurements, layered failures, mapping outcomes, inspection diagnostics, and Go/Rust transport differences.
• Add a shared canonical fixture and focused Go/Rust tests for unsupported, unmapped, and truncated evidence paths.
• Record the measured result and conservative migration decision in RFC 0001, ADR-0016, the migration contract, and consumer documentation.

ADR-0016 approves mechanical porting of occurrence identity and attachment plumbing behind the Go oracle. It approves no semantic checker category for replacement. Primitive/literal construction is only the next proposed independent Rust candidate; project loading, resolution, binding, symbols, inference, contextual typing, widening, overload/generic instantiation, narrowing, and recovery remain Go-authoritative.

The producer protocol is unchanged.

Validation

• ./internal/oxc_reference/run-evidence.sh --output /tmp/ts7-oxc-evidence-final.json — passed all six cases; the JSON gate for repeated stability, ambiguity, and transport mismatches passed.
• cargo fmt --check --manifest-path internal/oxc_reference/Cargo.toml — passed.
• cargo clippy --locked --manifest-path internal/oxc_reference/Cargo.toml --all-targets -- -D warnings — passed.
• cargo test --locked --manifest-path internal/oxc_reference/Cargo.toml — passed: 10 tests, 0 failed.
• go test ./internal/tsfacts ./internal/occurrencemap ./internal/semanticfacts ./cmd/tsfacts — passed.
• npx hereby build — passed.
• npx hereby lint — passed: 0 issues in the main module and _tools.
• npx hereby format — passed.
• npx hereby test — passed across all Go packages. The sandboxed macOS run could not start FSEvents streams; the required unsandboxed rerun passed, including internal/fswatch and internal/lsp/lspwatcher.