AX-1508 - Use compact --list-available output for the MCP catalog

[YoniMelki]

What

agent-guard --list-available now prints a compact, token-efficient TSV by default (see the paired jfrog/agent-guard change for AX-1508). This template now tells the agent to run it once and present the rows directly as a numbered table — no JSON parsing.

Why (AX-1508)

When a user asked "what mcps can I install?", the agent improvised python3 pipes to parse the verbose single-line JSON and failed repeatedly: json.load errors, truncated terminal output, and KeyError: 'packageName' (which is empty for remote/http MCPs).

Changes

• Drop the now-redundant --format compact flag from the --list-available command (compact is the default).
• Describe the output as compact TSV (name<TAB>type<TAB>version<TAB>description); the name column is the install identifier (also what --inspect --mcp matches) and is never empty.
• Add a Key Rule: never parse catalog commands with python3, and never capture them with 2>&1 (npm/npx stderr corrupts the stream).

Coordination

Pairs with the jfrog/agent-guard AX-1508 change (adds --format, makes compact the default). Ship together so npx --yes @jfrog/agent-guard resolves a version that supports the compact default.

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