T5.3: implement kt_sync_to_linear (real Linear GraphQL sync)

README.md

@@ -16,18 +16,15 @@ harness — not just one vendor's tool.
 
 ## Status
 
-Pre-release, v0.1.0. 12 of the 14 planned tools are fully implemented; 11 of
+Pre-release, v0.1.0. 13 of the 14 planned tools are fully implemented; 12 of
 those are dogfooded (KnoTrack tracks its own build using itself — see
 [`scripts/seed-self.ts`](scripts/seed-self.ts) and `docs/ROADMAP.md`'s T1).
-`kt_sync_to_github` is implemented as of T5.2 (2026-09-19) — idempotent
-one-way sync of a track to a GitHub Issue — and **offline-verified**, but not
-yet dogfooded: a real-repo dogfood run is its one remaining gate. The
-remaining 2 ship as stub
-slices: `kt_check_drift` returns a well-formed empty scan (real drift
-heuristics land in T6), and `kt_sync_to_linear` validates its inputs and
-the adapter precondition, returning a clear `CONFLICT` ("adapter not
-configured") or — once an adapter is configured — a "sync is not available
-in this build" error; Linear sync ships in T5.3.
+`kt_sync_to_github` (T5.2) and `kt_sync_to_linear` (T5.3) are both
+implemented as of 2026-09-19 — idempotent one-way sync of a track to a GitHub
+Issue / Linear Issue — and **offline-verified**; `kt_sync_to_github` has also
+been dogfooded against a real repo, and `kt_sync_to_linear`'s one remaining
+gate is a real-workspace dogfood. The one remaining stub is `kt_check_drift`,
+which returns a well-formed empty scan (real drift heuristics land in T6).
 
 Every change lands through a mandatory adversarial-review gate before it's
 considered reviewed: deterministic checks (build, lint, typecheck, unit,
@@ -43,22 +40,22 @@ include full diffs and raw model output.
 
 ## Tools
 
-| Tool                        | Status      | Purpose                                                                                     |
-| --------------------------- | ----------- | ------------------------------------------------------------------------------------------- |
-| `kt_register_project`       | implemented | Register (or upsert) a project by its source (`github`, `local`, etc.)                      |
-| `kt_get_project_status`     | implemented | Current status summary: tracks, items, drift flags                                          |
-| `kt_create_track`           | implemented | Create a track (a sequenced line of work) under a project                                   |
-| `kt_create_item`            | implemented | Create an item within a track, auto- or explicitly-sequenced                                |
-| `kt_record_session_summary` | implemented | Record a session's summary and re-check for drift                                           |
-| `kt_list_tracks`            | implemented | List a project's tracks, optionally filtered by status                                      |
-| `kt_get_track`              | implemented | Track detail: items plus dependency graph                                                   |
-| `kt_get_next_steps`         | implemented | Suggested next items given current status and dependencies                                  |
-| `kt_record_decision`        | implemented | Record a decision and the context behind it                                                 |
-| `kt_update_item_status`     | implemented | Move an item's status forward (or flag it blocked)                                          |
-| `kt_check_drift`            | stub        | On-demand drift scan (T2.11 stub: empty scan until heuristics ship in T6)                   |
-| `kt_render_roadmap`         | implemented | Render a roadmap view from tracked items                                                    |
-| `kt_sync_to_github`         | implemented | One-way idempotent sync of a track to a GitHub Issue (T5.2; real-repo dogfood gate pending) |
-| `kt_sync_to_linear`         | stub        | One-way sync to Linear (T2.14 stub: adapter precondition only; sync ships in T5.3)          |
+| Tool                        | Status      | Purpose                                                                                          |
+| --------------------------- | ----------- | ------------------------------------------------------------------------------------------------ |
+| `kt_register_project`       | implemented | Register (or upsert) a project by its source (`github`, `local`, etc.)                           |
+| `kt_get_project_status`     | implemented | Current status summary: tracks, items, drift flags                                               |
+| `kt_create_track`           | implemented | Create a track (a sequenced line of work) under a project                                        |
+| `kt_create_item`            | implemented | Create an item within a track, auto- or explicitly-sequenced                                     |
+| `kt_record_session_summary` | implemented | Record a session's summary and re-check for drift                                                |
+| `kt_list_tracks`            | implemented | List a project's tracks, optionally filtered by status                                           |
+| `kt_get_track`              | implemented | Track detail: items plus dependency graph                                                        |
+| `kt_get_next_steps`         | implemented | Suggested next items given current status and dependencies                                       |
+| `kt_record_decision`        | implemented | Record a decision and the context behind it                                                      |
+| `kt_update_item_status`     | implemented | Move an item's status forward (or flag it blocked)                                               |
+| `kt_check_drift`            | stub        | On-demand drift scan (T2.11 stub: empty scan until heuristics ship in T6)                        |
+| `kt_render_roadmap`         | implemented | Render a roadmap view from tracked items                                                         |
+| `kt_sync_to_github`         | implemented | One-way idempotent sync of a track to a GitHub Issue (T5.2; dogfooded against a real repo)       |
+| `kt_sync_to_linear`         | implemented | One-way idempotent sync of a track to a Linear Issue (T5.3; real-workspace dogfood gate pending) |
 
 Full request/response contracts for every tool, implemented or planned,
 are in [`docs/TRD.md`](docs/TRD.md).