[08/36] Require demo server fixtures for parallel tracks

[cjohnsto-nz]

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This is part 14 of 21 in a stack made with GitButler:

•  21  [22/36] Release 0.8.0 with packaged PDF.js preview #54
•  20  [21/36] Complete OC-070 protocol surface polish #56
•  19  [20/36] Record final OpenCollection supervisor acceptance #53
•  18  [19/36] Add OC-110 runtime authoring UX #52
•  17  [18/36] Add OC-080 runtime lifecycle and OC-110 task setup #51
•  16  [16/36] Record OC-050 OC-090 OC-100 supervisor audit #50
•  15  [15/36] Add OC-050 auth and transport support #49
•  14  [14/36] Add OC-100 request type UX #48
•  13  [13/36] Add OC-100 request type UX task #47
•  12  [12/36] Add OC-080 and OC-090 task tracks #46
•  11  [11/36] Record OC-010 through OC-040 supervisor audit #45
•  10  [10/36] Add OC-020 WebSocket support #44
•  9  [09/36] Add OC-010 GraphQL support #43
•  8  [08/36] Require demo server fixtures for parallel tracks #42 <-- current
•  7  [07/36] Record OC-000 and OC-060 supervisor audit #41
•  6  [06/36] Add OC-060 schema round-trip validation #40
•  5  [05/36] Add OC-040 runtime scripting support #39
•  4  [04/36] Add OC-090 gRPC streaming support #38
•  3  [03/36] Add OC-030 gRPC unary protobuf support #37
•  2  [02/36] Add OC-000 protocol dispatch foundation #36
•  1  [01/36] Add OpenCollection agent plan #35

[APKiwi]

Verdict: approve. The fixture skill encodes the right mandate (bind 127.0.0.1, deterministic ports and payloads, no external services, no internet dependence) and the GraphQL PR downstream actually complies with it. It's guidance-only with no enforcement, but in practice it held.

[cjohnsto-nz]

Not changing this. PR #42 is intentionally a guidance and acceptance-criteria change; duplicating fixture enforcement inside a Markdown skill would not create an executable guarantee. The enforcement belongs to the implementation branches and their automated tests.

At the current remote heads:

• PR [09/36] Add OC-010 GraphQL support #43, feature/oc-010-graphql-support at 4b199da5084e5a5aeff28108e3ff41230fed443a, provides the local GraphQL fixtures in examples/demo-api/GraphQL/, the server implementation in examples/demo-api/server.js, and executable coverage in test/graphqlSupport.test.ts and test/runtimeExecutionService.test.ts.
• PR [10/36] Add OC-020 WebSocket support #44, feature/oc-020-websocket-support at 87caf311fc41556af10ba4424b4c34444dd0c50a, provides the local WebSocket fixtures in examples/demo-api/WebSocket/ and executable coverage in test/webSocketSupport.test.ts.

PR #42 and its immediate child PR #43 are both currently MERGEABLE/CLEAN, with all reported checks passing. No code change is required on this branch.