Phase 9: Iris and Complementary Reimagined, off by default

Adrian, 2026-11-09: set up the shader but keep it disabled by default. Iris
1.8.14-beta.1 (built for the pack's Sodium 0.8.13) and Complementary Reimagined
r5.9.3, both client only and fetched from Modrinth. Default Options' extra
folder ships config/iris.properties with shaders off and Complementary
preselected, copied only when a player has none. Toggle Shaders is on M, the
only free letter; Iris's other keys are unbound. tools/build.py fails if the
settings name a shader file the pack doesn't install.

Smoke test passes; client dependencies are satisfied. Not launched on a client.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/roadmap.md

@@ -191,7 +191,7 @@ Goal: a quest book that points players onward, laid out like a research tree who
 
 - **Balance pass** on levels, drop rates, vein timers, job cooldowns, hazard damage and machine output, all from `docs/balance.md`.
 - **Every implemented Pokémon is obtainable** (Adrian, 2026-11-09). Every species Cobblemon has a model for must be reachable somewhere in the world, even if rarely or through crafting: a wild spawn, evolving a wild line, a fossil, or a crafted or summoned encounter. Legendaries and the like count too; they can be very rare or expensive. Checked on 2026-11-09: 95 of 905 implemented species are not reachable by a wild spawn or by evolving a wild line (legendaries, fossils, and lines the zone assignment left out, such as Aron, Litwick and Piplup). Report what is missing with a tool or self-test so new Cobblemon versions can't reopen the gap.
-- **A shader pack by default** (Adrian, 2026-11-09). Ship [Iris](https://modrinth.com/mod/iris) (client only) and [Complementary Reimagined](https://modrinth.com/shader/complementary-reimagined), switched on for new players; players can turn it off or pick a lower profile. Iris 1.8.14-beta.1+1.21.1-neoforge (MR `KduFYu4t`) is built against Sodium 0.8.13, which the pack already pins; it is the only NeoForge 1.21.1 build for Sodium 0.8, and a beta. Complementary r5.9.3 (MR `Bqen1mJX`) has the most downloads of the common shader packs and keeps a vanilla-like look, which suits Cobblemon's models. Its license allows modpacks if it is credited where the pack is described, left unmodified, and added through Modrinth or CurseForge's own systems, never as an uploaded file: the private pack has to download it from Modrinth. Check that Cobblemon's models, the machine and boss particles and the see-through blocks render properly with it on, and measure the frame-rate cost.
+- **A shader pack included** (Adrian, 2026-11-09). Ship [Iris](https://modrinth.com/mod/iris) (client only) and [Complementary Reimagined](https://modrinth.com/shader/complementary-reimagined), installed but off by default; players switch it on with a key or in Video Settings. Iris 1.8.14-beta.1+1.21.1-neoforge (MR `KduFYu4t`) is built against Sodium 0.8.13, which the pack already pins; it is the only NeoForge 1.21.1 build for Sodium 0.8, and a beta. Complementary r5.9.3 (MR `Bqen1mJX`) has the most downloads of the common shader packs and keeps a vanilla-like look, which suits Cobblemon's models. Its license allows modpacks if it is left unmodified, credited where the pack is described when it's on by default (it isn't; it's credited anyway), and added through Modrinth or CurseForge's own systems, never as an uploaded file: the private pack has to download it from Modrinth. Check that Cobblemon's models, the machine and boss particles and the see-through blocks render properly with it on, and measure the frame-rate cost.
 - **Performance.** Profile with spark on a server with realistic pen and machine counts; cap entity density through pasture config if needed.
 - **Multiplayer test** with Adrian's group.
 - **Release.** Final `docs/licenses.md`, credits and non-affiliation disclaimer; publish client and server packs on Modrinth and CurseForge as dependency-based packs.