docs: clarify opaque spec and wiki phrasing

[wcgomes]

Clarity-only wording pass on specs and wiki. No contract change: normative strength is unchanged (MUST / MUST NOT, fail-closed, and warn-skip stay as written).

Opaque labels that hid their referent were rewritten:

• matrix → the specific hook order, rows, URL scheme, color rules, or post-delete triggers
• smuggling → collisions (runArgs flags for first-class properties, even if that property is unset)
• remelt → kept as the operation name, glossed as re-merge and run on this start
• carve-out → exception
• analogue → stand-in / volume-mode counterpart
• ood → docker-outside-of-docker
• Wave A+B → the named allowlisted flags

Addresses #57

#57