Stage 5: bosses that move, attacks that warn, and a second boss

Boss movement is a property of the PHASE, not of the boss -- a fight that
stands still and then starts hunting you is one boss with two phases. Four
modes (STATIC, ORBIT, CHASE, WAYPOINTS) handled generically in
SimWorld._move_boss, so a boss that moves is still data. BossDef.stationary
is gone rather than kept beside the phases: a flag claiming the boss stood
still while a phase walked around would be a second source of truth and the
wrong one, so moves() is derived.

CHASE holds a distance instead of closing, because a boss standing on top of
you is a boss whose bullets cannot be read. Waypoints are fractions of the
arena so one phase works in rooms of different sizes. Every mode is speed
clamped in one place -- ORBIT computes an absolute destination and would
otherwise snap onto its circle on the first tick -- and movement slides
against geometry so a boss cannot walk through the pillars its own arena was
designed around.

The room clamp moved to after movement, where it is finally load-bearing. It
was a no-op while every boss stood still, which is exactly when an invariant
is cheapest to establish: boss rooms deliberately do not lock, so walking out
is always an escape, and that only holds if the boss cannot follow.

TelegraphedStrikeEmitter marks spots and fills them a moment later. The moment
between is the feature: a burst at your feet is a coin flip, the same burst
with a second of notice is a question. It stays stateless like every other
emitter -- they are shared resources and two bosses of the same kind must not
stomp each other -- so strike positions are derived from the volley number and
a test asserts the burst lands where the marker promised. Markers are drawn
through fog and through walls, unlike everything else in the view, because a
warning you cannot see is an unavoidable hit with extra steps.

The Cantor of the Vault fights in the choir vault: static, then a four-corner
circuit, then a chase, then orbiting while marking. It exists to prove the
format stretched, and a test asserts it uses both new mechanisms.

Which boss a run has now comes from its SEED rather than its depth. Depth is a
dev flag nothing in play raises, so the arena was keyed to something no player
can change and the second boss was unreachable in an actual game.

Two things found while finishing:

  - tools/export_content.gd had a hand-maintained boss list and had already
    gone stale, silently not writing the Cantor. Content.ALL_ENEMIES and
    ALL_BOSSES now feed the export tool, the renderer and five tests that each
    kept their own copy.
  - diag_loot failed intermittently after another diagnostic. Taking over from
    the bot cleared its input queue but not its HELD input, so a starved server
    coasted on the bot's last movement vector for half a second and walked the
    player off the item it had been placed on. The press arrived correctly,
    which is why "the press reached the simulation" passed while everything it
    should have caused failed.

check.sh clean, 409 tests, SMOKE PASS (19 assertions), all four diagnostics
green.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CLAUDE.md

@@ -92,7 +92,7 @@ and `tests/integration/test_replica_parity.gd` pin this down.
 | --- | --- |
 | `src/sim/` | The whole game as plain RefCounted objects. No nodes, no physics server, no rendering. |
 | `src/actors/` | Data-only `Resource` definitions: `EnemyDef`, `BossDef`, `ItemDef`, `LootDrop`, `DungeonDef`, `UpgradeDef`. Shapes, not instances. |
-| `src/sim/patterns/` | Bullet emitters — the authoring surface for every enemy and boss. |
+| `src/sim/patterns/` | Bullet emitters — the authoring surface for every enemy and boss. Emitters are stateless: they are shared resources, and two bosses of the same kind must not stomp each other. |
 | `src/sim/map_grid.gd` | Tile grid: collision, line of sight, chunk streaming. |
 | `src/sim/map_gen.gd` | Dungeon generation; `build()` is the only entry point. |
 | `src/content/rooms.gd` | Hand-authored room stamps (hub, boss arenas) as text. |
@@ -197,6 +197,12 @@ ticks in milliseconds with no SceneTree.
 - **No contact damage.** Every enemy threatens through bullets only; touching
   one is harmless. `tests/unit/test_content.gd` enforces that every hostile has
   an emitter.
+- **A boss never leaves its arena.** `SimWorld._step_boss` clamps to
+  `SimBoss.room` *after* movement. Boss rooms deliberately do not lock, so
+  walking out is always an escape — which only holds if the boss cannot follow.
+- **A telegraph must be visible through fog.** `WorldView._draw_telegraphs`
+  ignores line of sight on purpose; everything else in the view respects it. A
+  warning you cannot see is an unavoidable hit with extra steps.
 - **No i-frames.** Every bullet that touches a player lands; `spawn_grace` is
   the only invulnerable state. Do not reintroduce post-hit immunity — it makes
   dense patterns safer than sparse ones.
@@ -209,8 +215,13 @@ ticks in milliseconds with no SceneTree.
 
 A new enemy or boss is data, never code. Add a builder to
 `src/content/content.gd` returning an `EnemyDef` / `BossDef` made of the
-emitters in `src/sim/patterns/`, register its id in `enemy()` / `boss()`, and
-add a test. `tests/unit/test_boss.gd::test_a_brand_new_boss_needs_no_engine_changes`
+emitters in `src/sim/patterns/`, register its id in `enemy()` / `boss()` **and
+in `ALL_ENEMIES` / `ALL_BOSSES`** (the export tool, the renderer and the tests
+all iterate those), and add a test.
+
+A boss phase can move — `BossPhase.Move` is `STATIC`, `ORBIT`, `CHASE` or
+`WAYPOINTS`, handled generically in `SimWorld._move_boss`. Movement is a
+property of the phase, not of the boss. `tests/unit/test_boss.gd::test_a_brand_new_boss_needs_no_engine_changes`
 builds a boss from scratch and asserts the simulation needs no changes to run
 it — if you find yourself adding a per-boss branch to `SimWorld`, stop and add
 an emitter type instead.