[Vivswan]

What this changes

.github/scripts/release-pipeline.ts        1562 lines, every section in one file
->
.github/scripts/release-pipeline.ts         205  the header, the step constants, main()
.github/scripts/release-pipeline/git.ts     136  the git helpers every section shares, ancestry, position, manifest
.github/scripts/release-pipeline/tags.ts    522  packaged commits and the refs that name them (build tags, vX.Y.Z, latest, vX)
.github/scripts/release-pipeline/anchor.ts  223  release-please's boundary: the anchor, the boundary check, the anchor check
.github/scripts/release-pipeline/npm.ts     514  the pre-release version, the verdicts, the publish, the floor
.github/scripts/release-pipeline/draft.ts    45  the draft release's source and assets

test/scripts/release-pipeline.test.ts      2204 lines
->
test/scripts/release-pipeline.test.ts      1237  tags, anchor, draft, config
test/scripts/release-pipeline-npm.test.ts   997  the npm half

How

• Pure moves: every function keeps its text. Only imports, exports, and file headers are new.
• One entry file stays at the path the workflows and the test fixture invoke, holding main() alone.
• A directory, not lib siblings: lib/ holds helpers several scripts share, and these sections belong to one script.
• Every importer follows: the build test, the two workflow tests, and the comments that named the old file.

Proof

• Census: test( and test.each( call sites 71 before and after (47 + 24). Exports 37 before, all 37 still exported from their new modules, plus 12 helpers exported for cross-module use (listed below). Lines 1562 to 1645 for the script, 2204 to 2234 for the tests, the difference being headers and imports.
• Tests: the six touched test files 221 green, typecheck, biome, knip, and arch lint green.

Depends on #513, #515, and #517.

Technical details

• Newly exported from release-pipeline/git.ts: assertFullHistory, BOT_IDENTITY, FULL_SHA, git, gitOrNo, gitWithEnv, isAncestor, manifestVersionAt, push, resolveCommit, tryGit; from draft.ts: RELEASE_ASSETS (read by main).
• mainPosition moved to git.ts rather than npm.ts: tags.ts names build tags by it, so it is shared, not npm's.
• Moved text keeps its long lines (25 over 150 columns across the modules and the npm test); no moved line was edited.
• Library: none applies to a move.
• Outside this PR: CONTRIBUTING.md line 60 still names .github/scripts/release-pipeline.ts as where the topology lives. The entry file still exists, so the sentence stays true.
• Files: .github/scripts/release-pipeline.ts, .github/scripts/release-pipeline/{git,tags,anchor,npm,draft}.ts, .github/workflows/{update-release,update-release-pr}.yml (comments), test/scripts/release-pipeline{,-npm,-build}.test.ts, test/workflows/{checks-workflow,post-green-workflow,npm-publish-workflows}.test.ts.

[Vivswan]

Closed until #513, #515, and #517 are on main: this branch is a merge of two unlanded branches, so its diff cannot be a clean stack. The split is rebuilt on main and reopened once they land.

[Vivswan]

Superseded by #519: the head branch was rebuilt on #517's new head, and GitHub refuses to reopen a PR whose recorded head no longer exists.