v0.10.0

• Document imports — test and config YAML gain a top-level import: that
  inherits a shared base with deep-merge overrides: a relative path, a raw
  HTTP(S) URL, or { git, ref, file } against any git remote (SSH/HTTPS,
  self-hosted included; clones shell out to your system git, so existing
  credentials apply). Bases chain recursively; cycles are detected. See
  docs/core/imports.md and
  examples/import/.
• Fail-closed remote imports — network imports run only under the new
  --allow-remote-import CLI flag (run + lint); a document can never grant
  itself network access. URL/git-origin documents are confined to their own
  origin and can't read the local filesystem.
• Import caching — git imports cache under ~/.cache/perfscale/imports:
  tags and commit SHAs forever (immutable), branches revalidate via
  git ls-remote after a 5-minute TTL so ref: main follows the branch;
  --refresh-imports forces a refetch.
• perfscale lint now resolves imports and validates the merged document,
  reporting resolution problems (missing base, cycle, blocked remote) as
  regular findings.

Full Changelog: v0.9.0...v0.10.0