Add Superpowers compatibility adapter

[charliegillet]

Summary

• establish an identical Claude/Codex precedence policy that keeps Foreman authoritative for routing, model/effort selection, scope, worktrees, and the one-level worker hierarchy
• add mirrored superpowers-compat adapter skills and deterministic templates for implementers, task reviewers, scoped re-reviewers, and final reviewers
• preserve the Superpowers 6.2.0 engineering lifecycle, including task artifacts, TDD constraints, fix-round resume/escalation, a five-round circuit breaker, and deferred/parked finding handoff
• document installation, lifecycle mapping, supported version, and upgrade checks
• add hermetic contract tests plus live Claude and Codex routing probes with adversarial output validation

Testing

• python3 -B -m unittest discover -s tests -v — 26/26 passed
• python3 -B -m compileall -q tests — passed
• git diff --cached --check — passed before commit
• python3 -B tests/smoke_superpowers_contracts.py --platform claude --timeout 240 — PASS
• python3 -B tests/smoke_superpowers_contracts.py --platform codex --timeout 180 — PASS
• independent Codex Sol review of the full candidate, followed by scoped fix re-reviews — PASS, no remaining Critical/Important findings
• independent Claude Opus final review of the complete staged patch — PASS, no Critical/Important findings

Fixes #1