Add tink info command for environment and path introspection

[jon-devlapaz]

Problem

Agents and scripts operating with Tink frequently need to know:

• The active $TINK_HOME directory.
• The resolved path to the catalog ($TINK_HOME/catalog/by-project and by-skillset).
• The resolved library path ($TINK_HOME/skills).
• Whether the current working directory is inside an active project (.agents/skills/), inside $TINK_HOME, or neither.

Currently, agents have to infer these locations or inspect internal directories directly, which violates encapsulation and can fail if environment variables or home directories differ.

Proposed change

Add a tink info (or tink env) command that outputs resolved configuration and paths:

$ tink info
Tink version: 1.0.7
Home: /Users/jondev/.tink
Catalog: /Users/jondev/.tink/catalog
Library: /Users/jondev/.tink/skills
Active project: /path/to/project (or None)

With --json, emit a structured payload suitable for scripts and agent context initialization:

{
  "version": "1.0.7",
  "home": "/Users/jondev/.tink",
  "catalog": "/Users/jondev/.tink/catalog",
  "library": "/Users/jondev/.tink/skills",
  "activeProject": null
}

Acceptance

• tink info prints version, resolved home, catalog, library paths, and active project root (if detected).
• tink info --json outputs structured JSON.
• Non-zero exit code only if home resolution fails catastrophically.