[AZ-1074] [AZ-1075] gRPC tile stream tests and shared proto

Extract tile_provision.proto into GrpcContracts, add integration
tests and validation hardening for DeliverRouteTiles streaming.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/02_tasks/_dependencies_table.md

@@ -236,6 +236,15 @@ Parent-suite team may reorder steps 2–5 based on consumer priorities; step 1 (
 
 Originally tracked as a separate cycle 8b because AZ-812 is a wire-format rename (mirror of AZ-794) rather than a validator add (mirror of AZ-796). After the /autodev Step 10 ordering decision above, cycle 8b folds into cycle 8 as step 1 of the execution order. Section retained for traceability — the cycle-8b table entry remains the authoritative spec marker for AZ-812.
 
+### Step 9 cycle 9 (gRPC TileStream — AZ-1074 / AZ-1075)
+
+| Task | Depends On | Points | Status |
+|------|-----------|--------|--------|
+| AZ-1074 gRPC TileStream Service | — | 5 | Todo |
+| AZ-1075 gRPC TileStream Integration Tests | AZ-1074 | 3 | Todo |
+
+Execution order: AZ-1074 first (service + proto + unit/happy-path integration), then AZ-1075 (full blackbox suite). Origin: gps-denied-onboard consumer needs progressive tile delivery (blocks AZ-1076).
+
 ## Total Effort
 
 Step 6: 6 tasks, 17 story points
@@ -250,6 +259,7 @@ Step 9 cycle 6: 1 task scheduled (AZ-505 = 3 pts) — consumed from cycle-5 defe
 Step 9 cycle 7: 3 tasks adopted (AZ-794 = 3 pts rename, AZ-795 = epic with 5–8 pts shared-infra ship, AZ-796 = 3 pts first per-endpoint child) — total ~11–14 pts (over the 2–5 pts/cycle preference; AZ-795's shared-infra ship is the heavy item). Origin: gps-denied-onboard AZ-777 Phase 1 Jetson probe (2026-05-22). Sibling per-endpoint child tasks under AZ-795 to be added in future cycles as the parent-suite team enumerates the endpoint surface.
 Step 9 cycle 8: 5 tasks queued (AZ-812 = 3 pts Region DTO rename, AZ-808 = 3 pts region validator, AZ-809 = 5 pts route, AZ-810 = 5 pts UAV upload metadata, AZ-811 = 2 pts lat/lon GET) — total 18 pts across 4 per-endpoint AZ-795 children + 1 OSM-naming harmonization. Origin: cross-repo request from gps-denied-onboard agent (2026-05-22) for completeness of validation surface after AZ-795/796 landed, plus AZ-777 Phase 2 black-box probe surfacing the Region DTO as the lone OSM hold-out. Ordering: AZ-812 first (per /autodev Step 10 user decision), then AZ-808/809/810/811 (independent of each other modulo AZ-812). AZ-808 and AZ-809 specs amended 2026-05-22 post-probe to add `Id` non-zero-Guid rule + Route AC-10 input/output naming asymmetry advisory.
 Step 9 cycle 8b: folded into cycle 8 as step 1 (AZ-812). Section retained in dependency table for traceability.
+Step 9 cycle 9: 2 tasks created (AZ-1074 = 5 pts, AZ-1075 = 3 pts) — total 8 pts. gRPC TileStream for route-based progressive tile delivery.
 
 ## Coverage Verification