Task #222 partial — unblock AB Legacy PCCC via cip-path workaround (5/5 stages)

Replaced the "ab_server PCCC upstream-broken" skip gate with the actual
root cause: libplctag's ab_server rejects empty CIP routing paths at the
unconnected-send layer before the PCCC dispatcher runs. Real SLC/
MicroLogix/PLC-5 hardware accepts empty paths (no backplane); ab_server
does not. With `/1,0` in place, N (Int16), F (Float32), and L (Int32)
file reads + writes round-trip cleanly across all three compose profiles.

## Fixture changes

- `AbLegacyServerFixture.cs`:
  - Drop `AB_LEGACY_TRUST_WIRE` env var + the reachable-but-untrusted
    skip branch. Fixture now only skips on TCP unreachability.
  - Add `AB_LEGACY_CIP_PATH` env var (default `1,0`) + expose `CipPath`
    property. Set `AB_LEGACY_CIP_PATH=` (empty) against real hardware.
  - Shorter skip messages on the `[AbLegacyFact]` / `[AbLegacyTheory]`
    attributes — one reason: endpoint not reachable.

- `AbLegacyReadSmokeTests.cs`:
  - Device URI built from `sim.CipPath` instead of hardcoded empty path.
  - New `AB_LEGACY_COMPOSE_PROFILE` env var filters the parametric
    theory to the running container's family. Only one container binds
    `:44818` at a time, so cross-family params would otherwise fail.
  - `Slc500_write_then_read_round_trip` skips cleanly when the running
    profile isn't `slc500`.

## E2E + seed + docs

- `scripts/e2e/test-ablegacy.ps1` — drop the `AB_LEGACY_TRUST_WIRE`
  skip gate; synopsis calls out the `/1,0` vs empty cip-path split
  between the Docker fixture and real hardware.
- `scripts/e2e/e2e-config.sample.json` — sample gateway flipped from
  the hardware placeholder (`192.168.1.10`) to the Docker fixture
  (`127.0.0.1/1,0`); comment rewritten.
- `scripts/e2e/README.md` — AB Legacy expected-matrix row goes from
  SKIP to PASS.
- `scripts/smoke/seed-ablegacy-smoke.sql` — default HostAddress points
  at the Docker fixture + header / footer text reflect the new state.
- `tests/.../Docker/README.md` — "Known limitations" section rewritten
  to describe the cip-path gate (not a dispatcher gap); env-var table
  picks up `AB_LEGACY_CIP_PATH` + `AB_LEGACY_COMPOSE_PROFILE`.
- `docs/drivers/AbLegacy-Test-Fixture.md` + `docs/drivers/README.md`
  + `docs/DriverClis.md` — flip status from blocked to functional;
  residual bit-file-write gap (B3:0/5 → 0x803D0000) documented.

## Residual gap

Bit-file writes (`B3:0/5` style) surface `0x803D0000` against
`ab_server --plc=SLC500`; bit reads work. Non-blocking for smoke
coverage — N/F/L round-trip is enough. Real hardware / RSEmulate 500
for bit-write fidelity. Documented in `Docker/README.md` §"Known
limitations" + the `AbLegacy-Test-Fixture.md` follow-ups list.

## Verified

- Full-solution build: 0 errors, 334 pre-existing warnings.
- Integration suite passes per-profile with
  `AB_LEGACY_COMPOSE_PROFILE=<slc500|micrologix|plc5>` + matching
  compose container up.
- All four non-hardware e2e scripts (Modbus / AB CIP / AB Legacy / S7)
  now 5/5 against the respective docker-compose fixtures.

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

scripts/smoke/seed-ablegacy-smoke.sql

@@ -1,15 +1,17 @@
 -- AB Legacy e2e smoke seed — closes #213 (umbrella #209).
 --
--- Hardware-gated. The ab_server PCCC dispatcher is upstream-broken (task #222
--- tracks the lab rig + alternative fixtures), so verifying this seed end-to-end
--- requires real SLC 500 / MicroLogix / PLC-5 hardware or an RSEmulate 500
--- golden-box. The factory + seed ship here so the wiring is in place the
--- moment real hardware becomes available — no server code changes needed.
+-- Works against the ab_server PCCC Docker fixture (one of the slc500 /
+-- micrologix / plc5 compose profiles) or real SLC 500 / MicroLogix / PLC-5
+-- hardware. Default HostAddress below points at the Docker fixture with a
+-- `/1,0` cip-path; libplctag's ab_server rejects empty paths before routing
+-- to the PCCC dispatcher. Real hardware uses an empty path — change the
+-- HostAddress to `ab://<plc-ip>:44818/` (note the trailing slash with nothing
+-- after) before running the seed for that setup.
 --
--- Usage (once hardware is reachable):
+-- Usage:
+--   docker compose -f tests/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.IntegrationTests/Docker/docker-compose.yml --profile slc500 up -d
 --   sqlcmd -S "localhost,14330" -d OtOpcUaConfig -U sa -P "OtOpcUaDev_2026!" \
 --          -i scripts/smoke/seed-ablegacy-smoke.sql
--- (Update the `HostAddress` below to point at the real gateway first.)
 
 SET NOCOUNT ON;
 SET XACT_ABORT ON;
@@ -83,7 +85,7 @@ VALUES (@Gen, @DrvId, @ClusterId, @NsId, 'ablegacy-smoke', 'AbLegacy', N'{
   "TimeoutMs": 2000,
   "Devices": [
     {
-      "HostAddress": "ab://192.168.1.10/1,0",
+      "HostAddress": "ab://127.0.0.1:44818/1,0",
       "PlcFamily": "Slc500",
       "DeviceName": "slc-500"
     }
@@ -92,7 +94,7 @@ VALUES (@Gen, @DrvId, @ClusterId, @NsId, 'ablegacy-smoke', 'AbLegacy', N'{
   "Tags": [
     {
       "Name": "N7_5",
-      "DeviceHostAddress": "ab://192.168.1.10/1,0",
+      "DeviceHostAddress": "ab://127.0.0.1:44818/1,0",
       "Address": "N7:5",
       "DataType": "Int",
       "Writable": true,
@@ -117,6 +119,7 @@ PRINT '  Cluster:    ' + @ClusterId;
 PRINT '  Node:       ' + @NodeId;
 PRINT '  Generation: ' + CONVERT(nvarchar(20), @Gen);
 PRINT '';
-PRINT 'NOTE: hardware-gated. ab_server PCCC is upstream-broken (#222). Point the';
-PRINT '      DriverConfig HostAddress at real SLC / MicroLogix / PLC-5 / RSEmulate';
-PRINT '      and run the e2e script with AB_LEGACY_TRUST_WIRE=1.';
+PRINT 'NOTE: default points at the ab_server slc500 Docker fixture with a /1,0';
+PRINT '      cip-path (required by ab_server). For real SLC/MicroLogix/PLC-5';
+PRINT '      hardware, edit the DriverConfig HostAddress to end with /<empty>';
+PRINT '      e.g. "ab://<plc-ip>:44818/" and re-run this seed.';