fix(pi): register jafar-perf's MCP server in the pi package

[jbachorik]

What & why

jafar-perf used to live in btraceio/jafar-perf-box as a pi package whose manifest registered the plugin's .mcp.json (pi.mcp), so installing it into pi also brought the jafar MCP server. This repository's pi package lists skills only. A pi user moving here (which is where jafar's installer is about to send them, see the companion PR) would get the skills with no server behind them.

This adds pi.mcp: ./plugins/jafar-perf/.mcp.json to package.json, and makes validate-repository.js check that path exists, the way it already does for the skills directories, so the entry cannot rot.

Only jafar-perf's server is registered. pi.mcp also accepts a list, but jfr-analyzer's .mcp.json starts the same jfr-mcp daemon under another name, and pi would run two bridges for one server. Registering jafar-perf's alone is also what the old package did.

How verified

Command	Result
scripts/validate-marketplace.sh	passes: 5 plugins, 31 skills
validate-repository.js with pi.mcp pointing at a missing file	fails: pi: missing MCP config ./plugins/jafar-perf/nope.json
pi-mcp-adapter's own loadPackageMcpConfigs (run from a copy outside node_modules) against this package installed into a scratch pi home	registers btraceio_agent-plugins__jafar = jbang jfr-mcp@btraceio --stdio --attach
the same loader without the entry (what main has today)	registers no servers

Coverage notes

The loader run exercises the exact code pi's adapter uses to turn a package's pi.mcp into servers, on a real pi install of this branch. The validator change is covered by the negative case above.

Not verified / known limitations

• A live pi session calling a jafar tool through the adapter (needs model credentials); the check stops at the adapter registering the server.
• The pi package is the whole repository, so a pi install also brings the other plugins' skills. That was already true of this package and is unchanged here.

Why this is a draft: the live-session check above is missing. It flips to ready on your say-so; nothing else is open.

Breaking changes / migration

None. pi users who install this package now also get the jafar MCP server, as they did from the old repository.

Links

Companion: btraceio/jafar#120 (installer and docs repointed here), which should merge after this one. Part of moving jafar-perf-box users here before that repository is archived.

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