pkfire@0.10.0

Added

• pkf affected --files <path> simulates changed files without
  consulting git, and --explain reports the matching input patterns
  plus direct/dependent affected tasks.
• Taskfiles can declare workflowTests { ... }; pkf affected --check
  validates file-change expectations against the affected run plan.
• pkf explain <task> now includes declared deps, dependents, input
  patterns, outputs, and upstream affected trigger patterns.
• pkf list --json and pkf graph --json emit machine-readable task
  metadata, including aggregate/service kind, deps, inputs, outputs,
  cache state, workdir, params, and service metadata.
• pkf run --explain-cache <task> explains per-task action keys,
  hit/miss/forced-run decisions, local cache lookup paths, matched
  inputs, unmatched globs, broad input patterns, invocation overlays,
  and no-output cache notes.
• pkf lint now emits warning-level cache diagnostics for tasks with
  inputs but cache = false, and for build-like cacheable tasks that
  declare no outputs.
• Added examples/split-import, showing a single root Taskfile that
  imports task fragments under tasks/, shared constants under
  shared/, typed cross-file deps, and a deps-only aggregate.
• Added Pkl contract tests for the split/import example so the
  documented fragment convention is imported and validated directly.
• The repo's own preflight now runs test:workflow to dogfood
  workflowTests.

Changed

• Examples now amend the published pkfire@0.9.0 Pkl package.
• Shell completions now include the late-added explain, migrate,
  and pkl-cache commands and their core options.
• The repo's test:examples task now also runs example contract tests.