audit notes work completed, test fixes work (95% done), new sprints, new data sources setup and configuration

docs/modules/signer/implementation_plan.md

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+# Signer Implementation Plan
+
+## Purpose
+Define a concise, living plan for Signer DSSE signing, predicate registry, and attestor alignment.
+
+## Active work
+- `docs/implplan/SPRINT_20260112_015_SIGNER_path_witness_predicate.md`
+
+## Near-term deliverables
+- Register canonical path-witness predicate `https://stella.ops/predicates/path-witness/v1` with alias support.
+- Update predicate classification helpers and allowlists for reachability types.
+- Expand predicate allowlist tests and integration coverage for DSSE signing.
+- Maintain cosign-compatible DSSE outputs with deterministic canonical JSON.
+
+## Dependencies
+- Authority for OpTok and Proof-of-Entitlement checks.
+- Crypto provider registry and keyless or KMS backends.
+- Attestor and Policy verification rules for accepted predicate types.
+- Path witness contract updates in `docs/contracts/witness-v1.md`.
+
+## Evidence of completion
+- Predicate catalog updates in `src/Signer/StellaOps.Signer/StellaOps.Signer.Core/PredicateTypes.cs`.
+- Tests updated under `src/Signer/__Tests`.
+- DSSE bundles for path witness validate under Signer allowlist rules.
+
+## Reference docs
+- `docs/modules/signer/README.md`
+- `docs/modules/signer/architecture.md`
+- `docs/modules/platform/architecture-overview.md`
+- `docs/contracts/witness-v1.md`