Add draft skeletons for various documentation topics

- Created draft documentation for enabling reachability, CLI authentication, EntryTrace heuristics, Go stripped binaries, Java and Python lockfiles, Rust fingerprint enrichment, SAST integration, Windows/macOS analyzer coverage, scanner engine surface, multi-tenancy operations, RLS and data isolation, ABAC overlays, VEX trust model, VEX ops runbook, VEX mapping, scopes and roles, tenancy overview, VEX signatures, contract testing, VEX consensus algorithm, VEX consensus API, VEX consensus console, VEX consensus overview, and VEX issuer directory.
- Each document includes a status placeholder, purpose, and open TODOs for future updates.

docs/vex/consensus-overview.md

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+# VEX Consensus Overview — Draft Skeleton (2025-12-05 UTC)
+
+Status: draft placeholder. Inputs pending: PLVL0102 schema snapshot, issuer directory details.
+
+## Purpose
+- Explain why consensus exists and what assurances it provides (AOC scope).
+
+## Inputs
+- Evidence sources (attestations, SBOM edges) — to be confirmed.
+
+## Outputs
+- Decision artifacts; confidence/threshold handling.
+
+## Open TODOs
+- Fill concrete schema references and examples once PLVL0102 arrives.