Harness config 1.0.0-alpha.9

1.0.0-alpha.9 adds profile-local isolation for pack-style profile roots.
Selected profiles can now use .harnessProfileIsolation to suppress matching
base resources or dir outputs while keeping every active same-name profile root
participating, including wildcard-expanded pack roots and local override packs.

Profile Isolation

• Adds .harnessProfileIsolation as an optional profile-root declaration file
  with gitignore-style isolation patterns for resource and dir logical paths.
• Uses strict TOML shape for isolation declarations and the same negation plus
  last-match-wins pattern model as .harnessIgnore.
• Keeps missing isolation files as normal profile overlay behavior, so existing
  profiles continue to layer over base sources without excluding siblings.
• Preserves all active same-name profile roots while excluding matching
  non-profile/base candidates, which lets tools build portable pack selectors
  without rewriting manifests or root ignore files.

Projection, Validation, And Docs

• Excludes .harnessProfileIsolation from projection as a Harness declaration
  file and validates malformed declarations with dedicated diagnostics.
• Applies isolation consistently to resource projection and dir composition,
  including wildcard-expanded source roots and profile-local overlays.
• Updates the v1 standard, conformance checklist, diagnostics catalog, testing
  scenario map, and website-ready specification content with focused core and
  CLI regression coverage.