feat(lib)!: v6.1.0 — consolidate spawn/events/cache directories + drop doubled-segment leaves

[John-David Dalton (jdalton)]

Summary

v6.0 shipped a per-leaf-module split that produced doubled segments (/spawn/spawn, /ttl-cache/cache) and incoherent groupings — signal-exit/, warnings/, and process/abort are all process-event surfaces but lived in three different top-level directories. v6.1 fixes both shapes in one breaking pass:

• consolidate process-event surfaces under events/ and process/
• drop doubled segments (/spawn/spawn → /process/spawn/child, etc.)
• align default-getter leaves (getDefaultLogger → logger/default, getDefaultSpinner → spinner/default)
• fold promise-queue/ into the existing promises/ directory; merge its 11-line types.ts into the 219-line promises/types.ts (combined ~230, well under the 500-line soft cap)

This is pre-user: socket-lib has no external consumers yet, only the fleet repos which cascade after v6.1.0 publishes. No backcompat aliases — the v6.0 paths are gone.

Renames

v6.0 path	v6.1 path
`src/spawn/spawn.ts`	`src/process/spawn/child.ts`
`src/spawn/errors.ts`	`src/process/spawn/errors.ts`
`src/spawn/stdio.ts`	`src/process/spawn/stdio.ts`
`src/spawn/types.ts`	`src/process/spawn/types.ts`
`src/spawn/_internal.ts`	`src/process/spawn/_internal.ts`
`src/warnings/event-target.ts`	`src/events/warning/handler.ts`
`src/warnings/suppress.ts`	`src/events/warning/suppress.ts`
`src/signal-exit/register.ts`	`src/events/exit/handler.ts`
`src/signal-exit/intercept.ts`	`src/events/exit/intercept.ts`
`src/signal-exit/lifecycle.ts`	`src/events/exit/lifecycle.ts`
`src/signal-exit/signals.ts`	`src/events/exit/signals.ts`
`src/signal-exit/types.ts`	`src/events/exit/types.ts`
`src/signal-exit/_internal.ts`	`src/events/exit/_internal.ts`
`src/ttl-cache/cache.ts`	`src/cache/ttl/store.ts`
`src/ttl-cache/types.ts`	`src/cache/ttl/types.ts`
`src/spinner/registry.ts`	`src/spinner/default.ts`
`src/logger/logger.ts`	`src/logger/default.ts`
`src/promise-queue/queue.ts`	`src/promises/queue.ts`
`src/promise-queue/types.ts`	merged into `src/promises/types.ts`
`src/globs/glob.ts`	`src/globs/match.ts`
`src/links/link.ts`	`src/links/create.ts`

Removed directories: `src/spawn/`, `src/warnings/`, `src/signal-exit/`, `src/ttl-cache/`, `src/promise-queue/`.

Consumer migration

For a representative downstream `eco/npm/exec.ts`-style file, the v6.0 → v6.1 import diff:

```diff
-import { spawn } from '@socketsecurity/lib/spawn/spawn'
-import { isSpawnError } from '@socketsecurity/lib/spawn/errors'
-import type { SpawnOptions } from '@socketsecurity/lib/spawn/types'
-import { getDefaultLogger } from '@socketsecurity/lib/logger/logger'
-import { getDefaultSpinner } from '@socketsecurity/lib/spinner/registry'
-import { createTtlCache } from '@socketsecurity/lib/ttl-cache/cache'
-import type { TtlCache } from '@socketsecurity/lib/ttl-cache/types'
-import { onExit } from '@socketsecurity/lib/signal-exit/register'
-import { suppressWarnings } from '@socketsecurity/lib/warnings/suppress'
-import { PromiseQueue } from '@socketsecurity/lib/promise-queue/queue'
-import type { QueuedTask } from '@socketsecurity/lib/promise-queue/types'
-import { glob } from '@socketsecurity/lib/globs/glob'
-import { link } from '@socketsecurity/lib/links/link'
+import { spawn } from '@socketsecurity/lib/process/spawn/child'
+import { isSpawnError } from '@socketsecurity/lib/process/spawn/errors'
+import type { SpawnOptions } from '@socketsecurity/lib/process/spawn/types'
+import { getDefaultLogger } from '@socketsecurity/lib/logger/default'
+import { getDefaultSpinner } from '@socketsecurity/lib/spinner/default'
+import { createTtlCache } from '@socketsecurity/lib/cache/ttl/store'
+import type { TtlCache } from '@socketsecurity/lib/cache/ttl/types'
+import { onExit } from '@socketsecurity/lib/events/exit/handler'
+import { suppressWarnings } from '@socketsecurity/lib/events/warning/suppress'
+import { PromiseQueue } from '@socketsecurity/lib/promises/queue'
+import type { QueuedTask } from '@socketsecurity/lib/promises/types'
+import { glob } from '@socketsecurity/lib/globs/match'
+import { link } from '@socketsecurity/lib/links/create'
```

Verification

• `pnpm install` clean
• `pnpm run check --all` — code checks, lint (oxlint), format (oxfmt), types (tsgo) all green
• `pnpm run test` — full unit + integration + isolated suites pass
• No fleet-canonical files edited (`.claude/`, `.config/oxlint-plugin/*`, etc.)
• `docs/api-index.md` regenerated to match the new exports map
• `package.json` `exports` map regenerated via `scripts/fix/generate-package-exports.mts` — 19 old entries removed, 18 new entries added (one fewer because `promise-queue/types` folded into the pre-existing `promises/types` entry)

Notes for review

• The `./logger` and `./errors` fleet-compat aliases in `scripts/fix/generate-package-exports.mts` were updated: `./logger` now points at `./logger/default` (was `./logger/logger`).
• A single hardcoded test fixture path in `test/unit/git.test.mts` (the "files in subdirectories" case) was updated from `src/logger/logger.ts` → `src/logger/default.ts`.
• `DEFAULT_PREFIX = 'ttl-cache'` in `src/cache/ttl/store.ts` is intentionally unchanged — it's a runtime cacache namespace prefix; changing it would invalidate existing on-disk caches.

Test plan

• Reviewer pulls the branch and runs `pnpm install && pnpm run check --all && pnpm run test`
• Reviewer spot-checks 2–3 import sites to confirm new paths resolve
• After merge + v6.1.0 publish: fleet cascade updates each downstream consumer