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test: hash-split shard runner for directory-based test sharding (#2441)

* test: hash-split shard runner for directory-based test sharding

Add a reusable mechanism that splits an oversized test directory into N
buckets by stableHash(repo-root-relative path) % N, so new test files
auto-route to a bucket with no hand-listed file list. Rebalancing a
directory is a one-number edit (the split count).

- scripts/lib/shard-split.sh: portable helper (bash 3.2 + POSIX cksum, no
  associative arrays/globstar) exposing shard_split_bucket/count/report and a
  --self-test covering determinism, full coverage, balance, and stability
  under file addition.
- scripts/test-daemon.sh: source the lib; convert the hand-listed
  5-space-runtime-a/b split to hash-splitting via a documented
  HASH_SPLIT_SPECS config block; add --verify to validate the config.
- .github/workflows/main.yml: gate the config (self-test + --verify) in the
  check job to prevent silent file-drop regressions.

The old 5-space-runtime-a/b hand-lists had rotted and silently dropped 11 test
files (188 test cases, e.g. workflow-hook-engine, space-runtime-terminal-error-
recovery) from daemon unit CI; the hash split now covers all 52 runtime files
(612 + 1039 tests across the two shards).

* test: close two silent-drop gaps in --verify (review on #2441)

Address REQUEST_CHANGES review on #2441.

P1 (must fix): verify_shards now derives the expected -a/-b/… shard names
from each spec's split_count and asserts each is present in SHARDS (and no
stray prefix-* entry lingers after a count decrease). Catches the most likely
rebalancing mistake — bumping N without wiring in the new bucket — which the
union check can't catch (it's an identity) and which would silently drop a
whole bucket from CI.

P2 (should fix): the find cross-check now enumerates both *.test.ts and
*_test.ts (matching packages/daemon/vitest.config.ts), so its net is strictly
wider than the spec globs. A *_test.ts file the globs miss surface... (continued)

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