feat(test): eval-budgets timeout tiers + fit/ceiling policy test

Five named tiers (JUDGE 120s / CAPTURE 300s / CAPTURE_LONG 600s /
PTY 900s / PTY_LONG 1200s) replace hand-ratcheted sprawl (46x300s,
46x120s, 44x360s, 44x180s, 27x240s, 19x150s, 13x420s, 12x600s...),
much of it inflated to paper over the old 40-way in-shard concurrency
that the sharded runner's 1-file-per-shard model kills. Policy test
pins: every tier fits the shard wall minus 120s overhead (the
structural fix for budgets-above-the-wall fiction), tiers stay ordered,
and no paid literal exceeds PTY_LONG x1.25 — oversized tests get split,
not budgeted past the wall.

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

test/helpers/eval-budgets.ts

@@ -0,0 +1,43 @@
+/**
+ * Timeout policy for paid tests — five tiers instead of hand-tuned sprawl.
+ *
+ * Before this module the paid suite carried 46×300s, 46×120s, 44×360s,
+ * 44×180s, 27×240s, 19×150s, 13×420s, 12×600s, 7×700s… hand-ratcheted
+ * per test, several inflated to paper over the old 40-way in-shard
+ * concurrency (session startup queued behind 39 siblings and ate the
+ * budget before turn one — dead with the sharded runner's 1-file-per-shard
+ * model). Pick the tier that matches the test's SHAPE; escape-hatch raw
+ * literals stay legal with a justification comment (count-ratcheted by
+ * test/eval-budgets-policy.test.ts).
+ *
+ * Every tier must fit inside the lane walls — pinned by the fit test in
+ * test/eval-budgets-policy.test.ts against the sharded runner's
+ * DEFAULT_SHARD_TIMEOUT_MS. Budget above the wall is fiction, not headroom.
+ */
+
+/** LLM-judge call over an existing capture (no agent session). */
+export const JUDGE_MS = 120_000;
+
+/** One `claude -p` / SDK capture, bounded turns. */
+export const CAPTURE_MS = 300_000;
+
+/** Multi-capture or long multi-turn `claude -p` flows. */
+export const CAPTURE_LONG_MS = 600_000;
+
+/** Interactive real-PTY flow (spawn + skill + a few interactions). */
+export const PTY_MS = 900_000;
+
+/**
+ * Chained/judged PTY observation — the ceiling tier. 1200s leaves the
+ * 1800s shard wall real overhead; anything that genuinely needs more
+ * should be SPLIT, not budgeted past the wall.
+ */
+export const PTY_LONG_MS = 1_200_000;
+
+export const ALL_TIERS = {
+  JUDGE_MS,
+  CAPTURE_MS,
+  CAPTURE_LONG_MS,
+  PTY_MS,
+  PTY_LONG_MS,
+} as const;