Rewires the 4 SQL ladder sites in approval_service.go (canApprove,
hasQualifiedApprover, ListPendingForApprover, PendingCountForUser) to read
the new tuple: project_teams.responsibility ∈ {lead, member} AND
users.profession at or above the threshold. observer/external rows close
the gate even if the user's profession would otherwise qualify — that's
the project-level call.
approval_levels.go renamed levelOf → professionLevel and added
responsibilityOpensGate helper. New constants: ProfessionPartner /
ProfessionOfCounsel / … and ResponsibilityLead / ResponsibilityMember /
ResponsibilityObserver / ResponsibilityExternal. New validators
IsValidProfession + IsValidResponsibility. RoleSeniorPA kept as legacy
alias for the one remaining call site that hasn't migrated yet.
CRITICAL trap pinned by TestProfessionLevel_NilIsZero: NULL profession
returns 0, never silently defaults to associate. External collaborators
must stay ineligible.
derivation_service.go: requireWritePermission switches from pt.role='lead'
to pt.responsibility='lead' — project-management writes gate on the
project responsibility, not the firm tier. EffectiveProjectRole replaced
by UserProjectAuthorityLevel (thin wrapper over the SQL function in
migration 057). The legacy method was unused dead code despite t-139
design intent.
Tests extended: profession ladder, responsibility gate, NULL trap,
new validators. Build + vet clean.
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