feat: introduced max reasoning effort tier across model and rpc systems

- Introduced `Max` as a first-class reasoning effort tier across all packages, including AI providers, coding agent configurations, and RPC protocols.
- Refactored model effort ladders to use wire-exact mappings and removed legacy effort aliasing (e.g., `max-to-xhigh` mapping).
- Updated model registry and provider configurations to support `Max` tier routing, color themes, and UI icon associations.
- Expanded test suites to provide end-to-end coverage for the new reasoning tier, including updated compatibility and fallback scenarios.

packages/coding-agent/test/cli/completions.test.ts

@@ -211,7 +211,7 @@ describe("omp completions (integration / drift)", () => {
 		}
 		expect(stdout).toContain("{-r,--resume}");
 		// Real enum option sets flow through unchanged.
-		expect(stdout).toContain(":value:(off minimal low medium high xhigh auto)");
+		expect(stdout).toContain(":value:(off minimal low medium high xhigh max auto)");
 		expect(stdout).toContain(":value:(always-ask write yolo)");
 		// Real subcommands present; dynamic callbacks wired.
 		expect(stdout).toContain("_omp_cmd_commit");