docs(sprints): add Sprint 1 team briefings

Per-team sprint briefings under docs/sprints/sprint-1/ for server,
client, and joint tracks. Each lists assigned tickets, dependencies,
key decisions to read, and implementation notes. Agents use
ticket show <id> for full details.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/sprints/sprint-1/client.md

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+# Sprint 1: Run — Client Tasks
+
+**Goal:** Get a player-controlled character moving on screen through working IPC bridge.
+
+**Branch:** `client`
+**Agents:** Stig (UI), Oscar (networking)
+
+## Tickets
+
+| # | Title | Blocked by |
+|---|-------|------------|
+| #77 | MessagePack serialization - GDScript | #75 (done) |
+| #79 | LocalBridge implementation - GDScript | #77 |
+
+Use `db/connectors/ticket show <id>` for full details.
+
+## Key Decisions
+
+- `decisions/architecture.md` — D-020 (Godot+Rust IPC, MessagePack protocol)
+- `decisions/perception.md` — D-015 (camera locked to character), D-016 (monologue display)
+
+## Notes
+
+- #77 first: integrate a MessagePack library for Godot, implement encode/decode for ObserverSnapshot and PlayerInput.
+- #79 depends on #77: subprocess spawn, socket connection, message send/receive. Must match the Rust side's transport (Unix socket).
+- The existing SimBridge autoload trait is the integration point — LocalBridge implements it.

docs/sprints/sprint-1/joint.md

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+# Sprint 1: Run — Joint Tasks
+
+**Goal:** Get a player-controlled character moving on screen through working IPC bridge.
+
+**Branches:** `server` + `client` (merge to main for integration)
+
+## Tickets
+
+| # | Title | Blocked by |
+|---|-------|------------|
+| #81 | End-to-end connection test | #78, #79 |
+| #82 | Tick loop synchronization | #81 |
+| #83 | Moving character proof | #82, #236 |
+
+Use `db/connectors/ticket show <id>` for full details.
+
+## Key Decisions
+
+- `decisions/architecture.md` — D-020 (IPC protocol), D-010 (deterministic sim), D-031 (tick timing)
+
+## Notes
+
+- These are strictly sequential and depend on both server and client tickets completing first.
+- #81: Godot spawns Rust process, establishes connection, sends ping, receives pong.
+- #82: Full game loop — client sends input, server ticks, server sends snapshot, client renders.
+- #83: Sprint completion proof — arrow key press moves a sprite on screen through the full pipeline.

docs/sprints/sprint-1/server.md

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+# Sprint 1: Run — Server Tasks
+
+**Goal:** Get a player-controlled character moving on screen through working IPC bridge.
+
+**Branch:** `server`
+**Agents:** Dudley (simulation), Oscar (networking)
+
+## Tickets
+
+| # | Title | Blocked by |
+|---|-------|------------|
+| #78 | LocalBridge implementation - Rust | #76 (done) |
+| #236 | Tile collision system | — |
+
+Use `db/connectors/ticket show <id>` for full details.
+
+## Key Decisions
+
+- `decisions/architecture.md` — D-020 (Godot+Rust IPC, MessagePack protocol), D-010 (deterministic sim), D-030 (testability)
+
+## Notes
+
+- #78: Unix socket on Linux, message framing, subprocess management. The Rust-side MessagePack serialization (#76) is already done — build the transport layer on top.
+- #236: Walkability map with per-tile blocked/walkable flags. Movement system must check `can_move_to(tile)` before position change. Blocks the final "moving character proof" (#83).
+- Both tickets can be worked in parallel — no dependency between them.