feat(sidecar): protocol 11 — four map forwards (phase 14)

GET /map, GET /map/chunk, POST /map/render and GET /map/live, stamped and
forwarded like the reward routes (PLAN.md §30.2). Nothing is stored: the
picture passes through in 512 KiB slices and positions are never filed
(D111). A test asserts a base64 slice plus its envelope fits the game
link's 1 MiB line cap on the way back.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

sidecar/src/main.rs

@@ -153,10 +153,18 @@ use tracing_subscriber::EnvFilter;
 /// passes through untouched like the rest of that body. The tally, the kit catalogue and the chat
 /// memory all live in the plugin.
 ///
+/// # Protocol 11 — the map
+///
+/// `GET /map`, `GET /map/chunk`, `POST /map/render` and `GET /map/live`: the picture of this
+/// wipe's map, in slices, and everything that moves on it (the module's PLAN.md §30). Four more
+/// thin forwards. **Nothing here is stored**: the picture passes through to the website, which
+/// keeps it, and positions are asked for while somebody is looking and never touch the database
+/// (D111). Which layer a viewer may see is decided on the website, never here.
+///
 /// `docs/rust-link/PROTOCOL.md` is the specification — §8 the read path, §9 identity, §10 the
 /// mirror, §11 configuration, §12 clans, §13 the raid frame, §14 the leases, §15 the world verbs,
-/// §16 the rewards; this constant is one of its four declaration sites.
-pub const PROTOCOL_VERSION: u32 = 10;
+/// §16 the rewards, §17 the map; this constant is one of its four declaration sites.
+pub const PROTOCOL_VERSION: u32 = 11;
 
 fn main() -> anyhow::Result<()> {
     let args = match cli::parse(std::env::args().skip(1)) {