Three coupled changes to scripts/test-free-shards.ts:
1. STRICT OUTPUT: runFreeShard streams through the paid runner's
BunTestOutputClassifier — exit 0 without bun's 'Ran N tests across M
files' summary, with (fail) lines, or with a wrong file count is a
FAILURE (anti-truncation backstop at the runner layer), plus an
external wall-clock timeout that SIGKILLs the process group
(timed-out distinct from failed; exit 124 vs 1). Also fixes a latent
shard-bleed: file selectors now use exactTestFileSelectors (relative
paths were substring filters that matched sibling roots).
2. PARALLEL: full-suite mode is one 'bun test --parallel' invocation
(Bun 1.3.13). Measured semantics recorded in the header: per-file
worker isolation, standard summary, and mid-suite process.exit
surfaces as a crashed-worker FAIL with exit 1 — strictly safer than
serial, where the same exit truncates silently. No static weight
lists; --shards M --shard i keeps deterministic hash partitioning for
CI matrices (native --shard rejected: round-robin renumbers when
files land). Spawned shards get throwaway GSTACK_HOME/TMPDIR so
parallel shards can't contend on real state. Per-shard epilogue
prints files/seconds/status every run.
3. Stable indices: assignFilesToShards no longer drops empty shards, so
a shard's index depends only on the file hash and requested count —
an empty CI matrix slot is a fast no-op success, not a renumbering.
package.json 'test' now delegates to the runner (TEST_ROOTS becomes the
single source of truth for roots; slop:diff tail preserved; the runner
inherits the 30s per-test timeout the old glob passed inline).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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