Fix: create-expert references non-existent `think` tool in templates

[FL4TLiN3]

Description

The create-expert templates reference the think tool in pick lists, but this tool does not exist in @perstack/base.

Current Behavior

In create-expert-toml.ts, the ecosystem-builder templates include think:

pick = ["readTextFile", "think", "attemptCompletion"]

However, looking at apps/base/src/tools/, there is no think.ts file. The available tools are:

• append-text-file.ts
• attempt-completion.ts
• create-directory.ts
• delete-directory.ts
• delete-file.ts
• edit-text-file.ts
• exec.ts
• get-file-info.ts
• health-check.ts
• list-directory.ts
• move-file.ts
• read-image-file.ts
• read-pdf-file.ts
• read-text-file.ts
• todo.ts
• write-text-file.ts

Note: apps/base/README.md lists think as available, but the implementation doesn't exist.

Impact

Experts generated with pick = ["think", ...] will fail at runtime because the tool doesn't exist.

Affected Areas

• apps/create-expert/src/lib/create-expert-toml.ts (all template pick lists that include "think")
• apps/base/README.md (documents non-existent tool)
• docs/making-experts/base-skill.md (may need to document think if it should exist)

Acceptance Criteria

Either:

• Implement think tool in @perstack/base and document in base-skill.md
• OR remove think from all templates and documentation

Related

This issue also affects clearTodo which is documented in README.md but not implemented.

[github-actions]

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