Rebuild: phase 1 modules from the current app, ordered by pipeline stage

lib/nntp (XOVER client, Xref, GROUP), lib/headers (subjects, file keys,
segments from overview lines; the yEnc path stays behind for phase 2),
lib/release (identity, random names, now in lib), lib/files (aggregator,
volume names), lib/rules (posting tools, owner by priority, release
verdicts), lib/chunks (release chunk codec). Their unit tests came along;
new ones for codec, rules and volumes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/release/index.ts

@@ -0,0 +1,5 @@
+/**
+ * Grouping of files into releases (downloads), independent of AdonisJS.
+ */
+export { releaseIdentity, par2ReleaseIdentity, par2ReleaseName, rarReleaseIdentity, isGenericName, fileStem, subjectRemainder, namesRelease, isPostToken, type ReleaseIdentity, type ReleaseInput } from './identity.js'
+export { looksRandom } from './random.js'