refactor: rename internal 'project' terminology to 'benchmark'

[christso]

Closes #1020

What changed

Pure rename — no behavior changes, no wire format changes.

Core (packages/core/src/)

• Renamed projects.ts → benchmarks.ts
• ProjectEntry → BenchmarkEntry
• ProjectRegistry → BenchmarkRegistry (internal YAML key changes from projects: to benchmarks:; file path ~/.agentv/projects.yaml unchanged)
• All functions renamed: addProject → addBenchmark, removeProject → removeBenchmark, getProject → getBenchmark, touchProject → touchBenchmark, discoverProjects → discoverBenchmarks, deriveProjectId → deriveBenchmarkId, loadProjectRegistry → loadBenchmarkRegistry, saveProjectRegistry → saveBenchmarkRegistry, getProjectsRegistryPath → getBenchmarksRegistryPath

CLI (apps/cli/src/commands/results/serve.ts)

• withProject() → withBenchmark()
• projectEntryToWire() → benchmarkEntryToWire()
• Route params :projectId → :benchmarkId
• registry.projects → registry.benchmarks

Studio

• Types: ProjectEntry → BenchmarkEntry, ProjectSummary → BenchmarkSummary, ProjectListResponse → BenchmarkListResponse
• API hooks/options: all project* → benchmark* (e.g. useProjectList → useBenchmarkList)
• Route files: $projectId.tsx → $benchmarkId.tsx (URL structure unchanged)
• Components: projectId props/params → benchmarkId

Wire format preserved

• HTTP API URLs unchanged (/api/benchmarks, /api/benchmarks/:benchmarkId/...)
• JSON response bodies unchanged (e.g. { projects: [...] } still uses projects key)

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