Bound namespace history, task, timer, wait, command, and stream growth

[rmcdaniel]

Summary

• extend database-authoritative namespace quotas to workflow history, task, timer, wait, command, and stream rows
• distinguish queued ready tasks from separately bounded active leases so one-slot namespaces can still make net-neutral progress
• resolve namespace ownership for child rows and fail closed when ownership or quota policy cannot be evaluated
• expose the expanded fixed metric inventory and transactional rejection reasons
• pin Workflow 2.0.3 for namespace-fair bounded schedule batches and prepare Server 2.0.3 / Helm 0.1.74

Verification

• namespace quota suite against published Workflow 2.0.3: 18 tests, 119 assertions
• schedule integration suites against published Workflow 2.0.3: 107 tests, 443 assertions
• adjacent workflow/message stream and control-plane suites: 82 tests, 1,242 assertions
• full feature suite on the implementation commit: 1,894 applicable tests passed; the two phpredis transport tests skipped by the generic image passed separately (2 tests, 62 assertions)
• bounded-growth and environment contracts: 25 tests, 4,341 assertions
• Workflow 2.0.3 published-package verification: package install plus 16 Laravel/PHP upgrade cells passed
• source-release consumers synchronized; Composer manifest valid; Pint passes all changed PHP files

Refs #91