protocol: align SC vocabulary and durable intent with sealed product language

Add SessionCoordinatorPresent aliases, HC protocol-face naming, and abstract
durable intent/path-mismatch refuse invariants for FM1/FM4/FM5. TLC green at
395837 generated / 110013 distinct / depth 49.
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ms2k 2026-07-10 00:53:19 +09:00
commit 9b88a48b15

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