feat(zero): add warp to agents.json

[spencercharest]

Summary

Adds a Warp entry to plugins/zero/agents.json so zero init can provision Warp, and bumps the shared plugin version to 1.6.0 via make minor.

Warp has no plugin installer and no lifecycle hooks (established in #46), so this is a kiro-style standalone-only entry — no install block, no hooks block:

{
  "id": "warp",
  "name": "Warp",
  "detect": { "exe": "warp-terminal", "dir": ".warp" },
  "standalone": {
    "skills": [".warp/skills", ".agents/skills"],
    "mcp": { "file": ".warp/.mcp.json", "shape": "http-url" }
  }
}

Design notes

• Detection: primary signal is the ~/.warp config dir; warp-terminal is Warp's Linux binary name (macOS ships an app bundle with no CLI on PATH, but detect.exe is only the secondary plugin-vs-standalone signal and Warp has no install block anyway).
• Skills: Warp discovers home-level skills from ~/.warp/skills and ~/.agents/skills (https://docs.warp.dev/agent-platform/capabilities/skills/). Host-specific dir first, portable dir second, matching the kiro entry.
• MCP: Warp's global file-based config is ~/.warp/.mcp.json with {"mcpServers": {"zero": {"url": ...}}} — a bare url with no type field (https://docs.warp.dev/agent-platform/capabilities/mcp/), hence a new http-url shape name rather than reusing kiro's http-type-url.
• The CLI (@zeroxyz/cli ≥ 1.11.0) currently consumes only standalone.skills; mcp is carried as data for the future MCP-provisioning pass, same as kiro's entry. Wiring up the http-url shape is CLI-side work.

Relationship to #46

#46 (draft Warp adapter) ships the packaging side: plugins/zero-warp, scripts/build-warp.sh, and guides/warp.md. This PR is the matrix side — it makes zero init aware of Warp under the data-in-file/verbs-in-CLI model and does not depend on #46 landing.

Verification

• All six matrix entries validated against the CLI's agents.json zod schema (id/name/detect required, optional install/standalone, mcp needs file + shape) — all pass.
• jq . plugins/zero/agents.json parses clean.
• make version → 1.6.0; all four host manifests bumped in lockstep.

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