Why: Emergency Codex fallback must not run before Cursor, Antigravity, and PI have each been exhausted.
Evidence: Cursor transport 5e6c93f765c232783a7dccb05544e26c386fb031; 29 config tests, focused emergency controller test, and 449 governance tests passed with 19 skips.
Impact: Emergency-mode implementation, repair, and test roles now require exactly one enabled profile for each normal adapter while preserving configured order.
Refs: .task/feature-agent-cli-enforcement.md
Why: The approved contract requires exactly three safe attempts for Cursor, agy, and PI, then one Codex emergency attempt, never host implementation authority.
Evidence: Routing/config tests were RED for never, max attempts, forbidden adapters, and legacy host fallback; 133 related tests now pass with one opt-in probe skipped.
Impact: Normal emergency-mode roles reject all non-Cursor/agy/PI adapters, project fallback is never, and Codex remains available through emergency/review paths.
Refs: independent Codex review of feature/agent-cli-enforcement
Why: Normal execution roles must exclude Codex while a single enabled Codex adapter remains available for emergency routing and review.
Evidence: Parser invalid-case tests were RED before validation; all 17 config tests and agent_exec validate now pass.
Impact: Enables three attempts per normal profile, stable Cursor routing, and a validated emergency Codex profile.
Refs: feature/agent-cli-enforcement
Why: Routing needs an explicit per-profile attempt limit and a named Codex emergency profile before controller enforcement can be implemented.
Evidence: The new parser test failed on unknown keys before implementation; all 15 config test executions now pass and git diff --check is clean.
Impact: Adds backward-compatible optional configuration fields only; routing behavior is unchanged in this commit.
Refs: feature/agent-cli-enforcement
Why: Establish one validated project-local routing document before any real Agent execution is enabled.
Evidence: Cursor observed red then 12 green configuration tests; the host replays those tests, the temporary validation target, and whitespace checks during integration.
Impact: Adds the U1 configuration contract and parser only; real routing, adapters, controller execution, and governance adoption remain disabled.
Refs: docs/superpowers/plans/2026-10-15-project-agent-execution.md