ai-sdk decouple: relocate make:agent + ai-eval CLI commands to Rudder side (doctor done)

[suleimansh]

Part of epic #35. Relocate the Rudder CLI integrations out of @gemstack/ai-sdk to @rudderjs/ai.

Progress

• doctor check (@rudderjs/console) — done. Inlined in @rudderjs/ai/doctor (feat(ai): inline the AI doctor check instead of re-exporting it rudderjs/rudder#1454, merged) + removed from gemstack (feat(ai-sdk)!: drop the /doctor subpath, decouple from @rudderjs/console (#40) #45).
• make:agent scaffolder (MakeSpec from @rudderjs/console) — remaining. Entangled with the /server provider (ai-sdk decouple: relocate the /server provider (@rudderjs/core) to Rudder side #39): server/provider.ts lazy-imports commands/make-agent.js, so it must move together with ai-sdk decouple: relocate the /server provider (@rudderjs/core) to Rudder side #39.
• ai-eval CLI command (lazy @rudderjs/core config) — remaining. Blocked on ai-sdk: export GoogleCacheRegistry + eval fixtures helpers (prereq for #39 + ai-eval relocation) #46 (needs @gemstack/ai-sdk/eval to export defaultFixturesDir / readFixture / writeFixture first).

Blocked by

• ai-sdk: export GoogleCacheRegistry + eval fixtures helpers (prereq for #39 + ai-eval relocation) #46 (new public exports) and ai-sdk decouple: relocate the /server provider (@rudderjs/core) to Rudder side #39 (server, which make:agent rides with). 3-release sequence — see ai-sdk: export GoogleCacheRegistry + eval fixtures helpers (prereq for #39 + ai-eval relocation) #46.

[suleimansh]

Partial: the doctor check is the only independently-movable item, so it's done via rudderjs/rudder#1454 (inline) + #45 (remove). make:agent is entangled with the deferred /server provider (the provider lazy-imports it), and ai-eval needs new gemstack public exports (eval fixtures helpers). Both are deferred with #39 per the agreed scoping (avoid a 3-release sequence for now).

[suleimansh]

make:agent + ai:eval inlined on the Rudder side in rudderjs/rudder#1455 (driving the eval framework + fixtures helpers from @gemstack/ai-sdk@0.4.0/eval). With doctor (#1454) that completes the relocation; gemstack-side subpath removal is the #41 cleanup.