feat(doctor): warn on legacy package name + add example configs

- Doctor now detects when opencode.json references 'oh-my-opencode'
  (legacy name) and warns users to switch to 'oh-my-openagent' with
  the exact replacement string.

- Added 3 example config files in docs/examples/:
  - default.jsonc: balanced setup with all agents documented
  - coding-focused.jsonc: Sisyphus + Hephaestus heavy
  - planning-focused.jsonc: Prometheus + Atlas heavy

All examples include every agent (sisyphus, hephaestus, atlas,
prometheus, explore, librarian) with model recommendations.

Helps with #2823

docs/examples/coding-focused.jsonc

@@ -0,0 +1,50 @@
+// oh-my-openagent coding-focused configuration
+// Optimized for hands-on coding: Sisyphus + Hephaestus as primary workers.
+// Uses stronger models for implementation, lighter models for support agents.
+{
+  "agents": {
+    // Sisyphus with GPT 5.4 — strong coding performance
+    "sisyphus": {
+      "model": "openai/gpt-5.4",
+      "variant": "high"
+    },
+
+    // Hephaestus with GPT-5.3-codex — deep autonomous coding
+    "hephaestus": {
+      "model": "openai/gpt-5.3-codex",
+      "variant": "max"
+    },
+
+    // Atlas for orchestration when using /start-work
+    "atlas": {
+      "model": "anthropic/claude-sonnet-4-6",
+      "variant": "max"
+    },
+
+    // Prometheus for planning (Opus for best results)
+    "prometheus": {
+      "model": "anthropic/claude-opus-4-6",
+      "variant": "max"
+    },
+
+    // Lightweight agents for support tasks
+    "explore": {
+      "model": "anthropic/claude-haiku-4-5"
+    },
+    "librarian": {
+      "model": "opencode-go/kimi-k2.5"
+    }
+  },
+
+  "categories": {
+    "quick": {
+      "model": "anthropic/claude-sonnet-4-6",
+      "description": "Fast implementation tasks"
+    },
+    "deep": {
+      "model": "openai/gpt-5.4",
+      "variant": "high",
+      "description": "Complex multi-file changes"
+    }
+  }
+}

docs/examples/default.jsonc

@@ -0,0 +1,59 @@
+// oh-my-openagent default configuration
+// Copy this file to your project root as .opencode/oh-my-openagent.jsonc
+// or to ~/.config/opencode/oh-my-openagent.jsonc for global config.
+//
+// The legacy name oh-my-opencode.jsonc is also supported.
+{
+  // Agent model overrides
+  // Each agent can be configured with a specific model, variant, and prompt.
+  "agents": {
+    // Sisyphus: Main worker agent. Handles coding, debugging, refactoring.
+    // Best with: Opus (strongest), Sonnet (good), GPT 5.4 (officially supported)
+    "sisyphus": {
+      "model": "anthropic/claude-sonnet-4-6"
+    },
+
+    // Hephaestus: Deep autonomous worker, optimized for GPT models.
+    // Best with: GPT-5.3-codex (primary), GPT 5.4
+    "hephaestus": {
+      "model": "openai/gpt-5.3-codex"
+    },
+
+    // Atlas: Orchestrator agent. Reads plans and delegates tasks to Sisyphus-Junior.
+    // Best with: Opus (recommended), GPT (has optimized prompt)
+    "atlas": {
+      "model": "anthropic/claude-sonnet-4-6"
+    },
+
+    // Prometheus: Strategic planner. Creates detailed work plans.
+    // Best with: Opus (recommended)
+    "prometheus": {
+      "model": "anthropic/claude-opus-4-6"
+    },
+
+    // Explore: Codebase explorer (grep, file listing). Lightweight and fast.
+    "explore": {
+      "model": "anthropic/claude-haiku-4-5"
+    },
+
+    // Librarian: External documentation and code search.
+    "librarian": {
+      "model": "anthropic/claude-haiku-4-5"
+    }
+  },
+
+  // Category configurations for Sisyphus-Junior tasks
+  // Categories control which model is used when Atlas delegates work.
+  "categories": {
+    "quick": {
+      "model": "anthropic/claude-sonnet-4-6",
+      "variant": "normal",
+      "description": "Fast tasks: scaffolding, simple fixes, file moves"
+    },
+    "deep": {
+      "model": "anthropic/claude-sonnet-4-6",
+      "variant": "max",
+      "description": "Complex tasks: architecture, multi-file refactoring"
+    }
+  }
+}

docs/examples/planning-focused.jsonc

@@ -0,0 +1,56 @@
+// oh-my-openagent planning-focused configuration
+// Optimized for large projects: Prometheus planning → Atlas orchestration.
+// Uses Opus for planning and review, Sonnet for implementation.
+{
+  "agents": {
+    // Sisyphus with Sonnet — reliable implementation
+    "sisyphus": {
+      "model": "anthropic/claude-sonnet-4-6",
+      "variant": "max"
+    },
+
+    // Hephaestus as alternative worker
+    "hephaestus": {
+      "model": "openai/gpt-5.3-codex"
+    },
+
+    // Atlas with Opus — strong orchestration and task decomposition
+    "atlas": {
+      "model": "anthropic/claude-opus-4-6",
+      "variant": "max",
+      "prompt_append": "Leverage quick & deep agents in parallel when tasks are independent."
+    },
+
+    // Prometheus with Opus — best planning quality
+    "prometheus": {
+      "model": "anthropic/claude-opus-4-6",
+      "variant": "max",
+      "prompt_append": "Leverage quick & deep agents in parallel when tasks are independent."
+    },
+
+    // Support agents
+    "explore": {
+      "model": "anthropic/claude-haiku-4-5"
+    },
+    "librarian": {
+      "model": "anthropic/claude-haiku-4-5"
+    }
+  },
+
+  "categories": {
+    "quick": {
+      "model": "anthropic/claude-sonnet-4-6",
+      "description": "Scaffolding, config changes, simple fixes"
+    },
+    "deep": {
+      "model": "anthropic/claude-sonnet-4-6",
+      "variant": "max",
+      "description": "Core module implementation, refactoring"
+    },
+    "unspecified-high": {
+      "model": "anthropic/claude-opus-4-6",
+      "variant": "max",
+      "description": "High-stakes tasks requiring maximum quality"
+    }
+  }
+}