feat(maxio-sdk-clone): experimental map-in-clone plugin variant

[mohammadali2549]

Add an experimental maxio-sdk-clone plugin (map-in-clone variant)

Adds a new experimental plugin, maxio-sdk-clone, forked from maxio-sdk (v0.2.0). It tests a
different way of delivering the SDK map: instead of bundling the generated map inside the plugin,
the map ships inside the SDK's own source, and the agents clone the SDK to read it.

What changes vs maxio-sdk

• The bundled map is removed from the plugin (sdk-map.md + map/, ~4,180 lines). It is read
  from <clone>/sdk-map.md + <clone>/map/ instead.
• maxio-plan clones the SDK first (gains Bash) and grounds against the map that ships with the
  source, opening the exact source file the map names only when the map genuinely can't settle a fact.
  maxio-debug reuses that clone via the shared temp .maxio-session.md.
• A hard anti-spelunk guard in both agents + maxio-getting-started: map first, always; open only
  the exact file the map's row names, scoped; grepping/globbing/find-ing the tree to locate
  something is a defect — the map is the locator.
• Main-agent fallback for a missing fact is now ask the warm maxio-plan agent (the map no longer
  lives in the plugin for the main agent to read).
• The clone stays hidden from the main agent (temp-only, path never enters maxio-plan.md); the
  version pin is dropped (the map co-versions with the source by construction).

Why

Probes the middle ground between the bundled-map maxio-sdk and the map-less upstream plugin: does
co-locating a fresh, always-in-sync map with the source (source always at hand) beat bundling? It also
realizes the generator's stated end-state — the map generated and shipped alongside the SDK.

Notes for review

• Additive: the baseline maxio-sdk plugin is untouched, so the experiment's baseline
  comparability is intact. Targets dev-raw (the experimental line); main stays frozen.
• claude plugin validate --strict passes for both the plugin and the marketplace manifest.
• During the experiment the agents clone the fork/branch that carries the map
  (mohammadali2549/advanced-billing-sample-sdk @ docs/sdk-map, PR pending); once that map is
  merged upstream this points to the canonical asadali214/advanced-billing-sample-sdk at a tag.
• Caveat: maxio-sdk-clone shares skill/agent names with maxio-sdk — don't install both at once
  (noted in its marketplace description). Fine for the experiment (arms install one plugin at a time).

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