docs/plans: mark R0.6 + CW-1 done; note 2020-only live-verification constraint

The local Historian is 2020 (WCF/32568); the 2023 R2 gRPC endpoint (32565) is
absent, so M0 gRPC routing can be unit-tested but not live-verified here.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/plans/hcal-roadmap.md

@@ -9,6 +9,21 @@ HCAL replacement, built on the **2023 R2 gRPC transport**. Derived from
 > protocol serializer/parser + golden-byte unit test + an env-gated live integration
 > test against the local Historian.
 
+## Progress (updated 2026-06-19)
+
+- ✅ **R0.6 version gate** — `HistorianServerVersionGate` + `HistorianClientOptions.VerifyServerInterfaceVersion`;
+  fail-closed on connect, wired into both WCF and gRPC paths. Supported versions are
+  evidence-based (Hist=11, Retr=4, Trx=2; Status reachability-only), captured from the
+  live server. 10 unit tests.
+- ✅ **CW-1 capture pipeline** — `ProtocolCaptureSanitizer` + `ProtocolFixtureWriter` +
+  `capture-tag-info` CLI command; produces sanitized `fixtures/protocol/<op>/` golden files.
+  11 unit tests. First fixture: `get-tag-info/analog-*.json`.
+
+> ⚠️ **Live-verification constraint:** the local Historian is **2020** (WCF, port 32568) — the
+> 2023 R2 gRPC endpoint (32565) is absent. M0's gRPC routing (R0.1–R0.4) can be built and
+> golden-byte/unit-tested here but **cannot be live-verified** without an actual 2023 R2 server.
+> Treat gRPC ops as unverified until then; the byte payloads remain the proven 2020 protocol.
+
 ## Guiding principles
 
 1. **gRPC-first.** New ops go on the `RemoteGrpc` transport (clean protobuf envelope);