* refactor(#1679): ADR-1239 Phase B — collapse is<Runtime> flag blocks into runtimeFlags [AC2 slice 3] Phase 2 AC2 slice 3. Collapses the four duplicated 'const isX = runtime === x' declaration blocks in bin/install.js (uninstall / writeManifest / install / a fourth helper — 48 of the 101 remaining runtime=== branches) into a single runtimeFlags(runtime) helper in src/runtime-name-policy.cts, sibling to getDirName / getRuntimeLabel / getGlobalConfigHomeFragment. The purest add-a-host tax: a new runtime meant remembering to add ~12 flag lines to each of four functions. Now it is one entry in RUNTIME_FLAG_IDS. - src/runtime-name-policy.cts: RUNTIME_FLAG_IDS + runtimeFlags(runtime) -> frozen map of is<Runtime> booleans (single runtime=== source, via loop). - bin/install.js: import runtimeFlags; replace the 4 declaration blocks with one destructure each. ZERO usage-site churn (flag names preserved; install.js's eslint block has no no-unused-vars rule so destructure-all is clean). - tests/runtime-flags.test.cjs: 4 tests (each runtime sets exactly its flag, claude/unknown/empty -> all false, all 15 flags present + frozen, drift guard). runtime === count: 101 -> 53 (-48). golden-install-parity 16/16 byte-identical (behavior-identical collapse). AC2 data-collapse now substantially complete; ADR-1235 agent-loop tail + per-runtime semantic residue remain (separate). * chore(changeset): add Changed fragment for runtimeFlags collapse (#1679)
Changeset Fragments
This directory holds per-PR CHANGELOG fragments. Every PR with user-facing changes drops one (or more) <random-name>.md files here describing its CHANGELOG entry. Fragments are consolidated into the top-level CHANGELOG.md at release time.
Why
Two PRs that both edit the ### Fixed block of CHANGELOG.md always conflict on merge — git can't pick a serialization order without human input. Two PRs that each add a fresh .changeset/<unique-name>.md never conflict because they don't share lines.
See #2975 for the full rationale.
Adding a fragment
node scripts/changeset/new.cjs \
--type Fixed \
--pr 1234 \
--body "fix the thing — explain the user-visible change in one sentence"
This writes .changeset/<adjective>-<noun>-<noun>.md with frontmatter and a body. Three random words → concurrent PRs don't collide.
Format
---
type: Fixed
pr: 1234
---
**`/gsd-foo` no longer drops trailing slashes** — explain the user-visible change.
Allowed type: values follow Keep a Changelog: Added, Changed, Deprecated, Removed, Fixed, Security.
Opting out
PRs that legitimately have no user-facing impact can add the no-changelog label. CI honors it. When unsure, add the fragment.
At release time
Promotion is automatic. The release workflow's finalize job runs:
node scripts/changeset/cli.cjs render --version vX.Y.Z --date YYYY-MM-DD --allow-empty
This reads every fragment, groups bullets by type:, replaces ## [Unreleased] with a new ## [vX.Y.Z] - YYYY-MM-DD block, opens a fresh ## [Unreleased] above, and deletes consumed fragments. The --allow-empty flag ensures a no-change release still gets a dated heading (with a _No notable changes._ placeholder). A subsequent verify step confirms the promotion landed correctly. Maintainers do not run this by hand.
Archived fragments
.changeset/archived/ holds fragments for already-shipped releases (≤ 1.3.1), retained for provenance. Their content was hand-curated into the dated ## [1.x.y] sections of CHANGELOG.md during the #690 backfill — they were never consumed by render. All changeset tooling enumerates .changeset/ non-recursively, so archived fragments are never picked up or rendered. Do not move them back to the top level.