Loki Mode v7.15.0

Added

• Open-core hooks (R9 of the competitive arc): the seams for hosted + enterprise
  • paid plans WITHOUT gating any existing free feature or faking a service.
    Loki stays fully functional open-source with zero hosted backend.
• loki proof share --hosted <id>: publishes the already-redacted proof artifact
  to an operator-supplied LOKI_HOSTED_ENDPOINT (both bash and Bun routes). With
  no endpoint set, it prints an honest "no official hosted backend yet; set
  LOKI_HOSTED_ENDPOINT or use a gist" message and exits non-zero. It never
  fabricates a URL and only reports the URL the operator endpoint returns.
• Tier seam (LOKI_TIER, default oss; LOKI_LICENSE_KEY optional): a no-op
  ALLOW for OSS, wired ONLY into the opt-in --hosted seam, never into any free
  command. License verification is a documented stub (no backend yet).
• docs/OPEN-CORE-BOUNDARY.md: the explicit free-forever vs hosted/paid boundary,
  with a binding commitment never to move an existing free feature behind a
  paywall.

Security

• The --hosted publish guard fails CLOSED: it refuses unless the proof's
  redaction was confirmed applied (redaction.applied == true), on both routes.
  This prevents publishing an old/degraded proof whose HTML might carry secrets
  to the operator endpoint (council round 1 found the Bun route fail-OPENED on
  absent redaction metadata; fixed + regression-tested on both routes).

Notes

• Council: 3-of-3 unanimous (round 2, after the fail-closed redaction fix).
• NOT shipped: a live Loki hosted backend / SaaS / license server (R9 ships the
  seams only); the proof.json public_url is printed, not written back.