v0.15.0

Added

• Per-parent-task delegation tree (cross-process linkage, scatter-gather roadmap #39 stretch /
  closes #52). Each delegated sub-call is now linked back to the specific top-level task that
  spawned it, across the process boundary. The CLI mints a task id per routed task; the
  orchestrator-CLI adapter injects it as TANGLEBRAIN_TASK_ID into the orchestrator's environment
  (only when the delegate tool is injected), the orchestrator forwards it to the MCP delegate child
  it spawns, and run_delegate reads it back to stamp each delegate record's parent_task_id. Task
  records gain a task_id, delegate records gain a parent_task_id (both written only when present,
  so existing records and readers are unaffected). tanglebrain --stats and the rollup gain a
  by_parent grouping — "Linked to: N parent task(s)" — with sub-calls run outside a propagated task
  grouped as unlinked. The linkage was manually verified live through the real claude→MCP-delegate
  boundary (the env survives the orchestrator's subprocess hop; the parent and delegate records
  shared the same id) — the orchestrator-forwards-env hop is a load-bearing assumption, not a
  TangleBrain-enforced guarantee, so a delegate that loses the env degrades safely to unlinked (never
  an error). This was the deferred half of the scatter-gather epic whose entry criterion was a
  live-verification spike — now done.
• Knob panel surfaces the delegation tree. The panel's "Delegated sub-tasks" card now shows a
  Linked to stat (N parent task(s), with any unlinked sub-calls noted) — GUI parity with the
  tanglebrain --stats rollup, so the per-parent-task linkage is visible in the panel, not just the
  CLI. Read-only; no new endpoint (the data already rides view_stats's rollup payload).

Fixed

• pyproject.toml package metadata carried the purged "cost-tiered / flat-rate subscriptions"
  framing that the public-rollout neutralization scrubbed everywhere else (#42). Both the description
  and the cost-tiered entry in keywords (→ local-llm) — the metadata rendered on the repo and any
  package index — now match the neutral positioning used in the README and ARCHITECTURE.md:
  "A local-first, config-driven LLM router across OpenAI-compatible backends you own."

Internal

• Gated live smoke check for delegate parent-task linkage (closes #55). A TANGLEBRAIN_LIVE-gated
  test routes a delegation-inducing prompt through the real router → orchestrator → delegate_local
  and asserts each delegate record's parent_task_id matches the parent task's task_id — a standing
  guard for the load-bearing "orchestrator forwards env to the MCP child" assumption (it skips, never
  fails, if the orchestrator doesn't delegate that run, since delegation is emergent). Test-only; gated
  off in CI.