giles 01e5f876bc W14: pin K19 MCP-harness/runtime primitive parity (test-only) ...

mcp_tree.ml's parallel primitive table drifted from sx_primitives.ml —
the spec-mandated harness verification path silently produced false
findings ((get {:a 1} :a 99) -> nil vs 1, char-class vs substring split,
etc.). dc7aa709 aligned 8 entries as a stopgap; the real fix (linking
sx_primitives) is hosts-lane.

Add scripts/test-harness-parity.sh: drives mcp_tree.exe sx_eval via raw
JSON-RPC and a fresh sx_server.exe via the epoch protocol, runs the
finding's 12-probe battery through both, fails on any divergence (errors
compared by inner message). 12/12 parity today — the stopgap holds and
can no longer rot silently.

Test-only: no semantics edits, no push.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-04 01:41:07 +00:00

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