prep docs and service updates

docs/samples/linkset/prep-22-001.md

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+# Samples Prep — PREP-SAMPLES-LNM-22-001
+
+Status: **Ready for implementation** (2025-11-20)
+Owners: Samples Guild · Concelier Guild
+Scope: Produce finalized advisory linkset samples aligned to frozen Concelier linkset schema (LNM-21-002 freeze on 2025-11-20).
+
+## Inputs
+- Link-Not-Merge schema: `docs/modules/concelier/link-not-merge-schema.md` (frozen 2025-11-20) and samples under `docs/samples/lnm/`.
+- Evidence bundle v1 and console fixtures (for hashes) already published.
+
+## Deliverables
+- Two NDJSON fixtures placed under `samples/linkset/`:
+  - `lnm-advisories-sample.ndjson` — 1k advisory observations with conflicts (NVD vs GHSA vs OSV) using frozen schema.
+  - `lnm-vex-sample.ndjson` — 500 VEX linkset entries with differing exploitability per product.
+- Each file accompanied by `.sha256` hash.
+- README (`samples/linkset/README.md`) describing schema version, generation seed, and deterministic ordering rules.
+
+## Determinism
+- Generation seed: `2025-01-01T00:00:00Z` (use in faker/RNG).
+- Sort records by `observationId` before writing; timestamps set to deterministic `2025-01-02T00:00:00Z` for all entries.
+
+## Acceptance criteria
+- Files validate against frozen LNM schema without additional fields.
+- Hashes recorded; no external network calls to create fixtures.
+- README references the schema doc and seed; links added back into Sprint 0509 Delivery Tracker.
+