…keleton (v0.10.0 foundation)

Adds the v0.10.0 trace-topology foundation (Track G): the Spar_Identity
property surface and the spar-trace-topology crate skeleton so future
work has a home and the v1 reconciliation contract has a published
identity surface. Parsers (PCAPNG / LLDP / Qcc) and the reconciliation
engine ship in v0.10.x / v0.11.0 sibling commits per the new design
doc.

Property set (crates/spar-hir-def/src/standard_properties.rs):
- New Spar_Identity::* with 6 properties (MAC_Address, VLAN_ID,
  Stream_Handle, Multicast_Group, LLDP_Chassis_Id, LLDP_Port_Id)
- STANDARD_PROPERTY_SET_NAMES + lookup_table arms + count test 131→137
- Two new tests (set membership + GlobalScope resolution); 28 total
  standard_properties tests pass.

Crate (crates/spar-trace-topology/, ~600 LOC):
- identity.rs: 6 typed accessors, typed-first / string-fallback per
  the existing Spar_TSN pattern. VLAN_ID rejects values outside
  0..=4094 on both paths.
- ingest.rs: 4 placeholder traits (FrameSource, TopologySource,
  SwitchConfigSource, PtpTimeSource) with TODO(v0.10.0+) markers
  pointing at the design doc.
- reconcile.rs: ReconcileFinding enum carrying the 5 deterministic
  check kinds (IdentityUnknown, TopologyMissingWiring, ConfigDrift,
  GptpOutOfBudget, BinaryMismatch) — type surface only, no engine.
- report.rs: TopologyReport struct aggregating findings.
- tests/identity_accessors.rs: 6 round-trip tests covering both
  typed and string-fallback paths for every accessor.

Docs:
- docs/designs/v0.10.0-trace-topology.md (445 lines / 2728 words):
  full v1 design — input artefact set, the 5 deterministic checks,
  SARIF + in-toto attestation predicate URL
  https://pulseengine.eu/spar-trace-topology/v1, implementation
  phasing (v0.10.0 foundation → v0.10.x parsers → v0.11.0 engine →
  v1.0 signed attestation), minimum-viable v1 fixture.
- docs/contracts/spar-trace-topology-v1.md (222 lines / 1172 words):
  external-integrator contract — predicate URL, input artefact list,
  SARIF rule ids, in-toto envelope shape, stability promise (v1
  readers MUST refuse v2+ blobs).

Artefacts:
- REQ-TRACE-TOPOLOGY-001 (Spar_Identity surface) +
  REQ-TRACE-TOPOLOGY-002 (crate skeleton) added to requirements.yaml
- TEST-TRACE-TOPOLOGY-IDENTITY added to verification.yaml linking
  both REQ-TRACE-TOPOLOGY-* entries.

Out of scope for this PR (v0.10.x / v0.11.0 / v1.0):
- Real PCAPNG / LLDP / Qcc parsing
- Reconciliation engine
- SARIF emission
- in-toto attestation signing

Workspace version unchanged.

Quality gates: cargo build/clippy/fmt clean across the workspace;
cargo test --workspace passes (75 test result lines, no failures);
rivet validate PASS (99 pre-existing warnings).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>