chore(changeset): catch-up changesets for 6 untracked v1.9.0 fixes

[clay-good]

Status

Ready for review. Adds only .changeset/*.md files — no code changes.

What was missing

Six user-facing fixes merged after v1.8.0 without a changeset. As-is, the v1.9.0 Version Packages PR (#1629) would ship them with no changelog entry, and three external contributors would go uncredited:

PR	Fix	Author
#1637	archive: preserve blank lines around ## Requirements when syncing specs	@jwang513
#1607	schema fork: preserve YAML formatting	@clay-good
#1632	config picker: label the update workflow; drop "expanded-profile" wording	@clay-good
#1616	schemas: honor canonical root selection	@Patodo
#1612	cli: reject missing roots for list and validate	@clay-good
#1523	validate: warn on ambiguous task numbering	@alectimison-maker

What it does

Adds one patch changeset per fix, each with a user-focused description and a manual Thanks @author credit + PR link (since the changeset is authored here, not in the original PR).

Proof it's safe

• All six are patch bumps. changeset status still resolves @fission-ai/openspec to minor → 1.9.0 — the release target is unchanged; this only fills in the changelog.
• No source, test, or config files touched.

Next step

Once merged, the Changesets action regenerates the Version Packages PR (#1629) to include all 17 items. Then #1629 can be approved and merged to publish v1.9.0.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Archiving specs and rebuilding spec.md now preserves blank lines around the Requirements heading.
  • Schema forking preserves YAML comments, formatting, and key order.
  • Bulk validation and JSON listing require an existing OpenSpec root.
• Improvements
  • Updated config picker labels and terminology for clearer update workflows.
  • Schema listing supports canonical root selection and --store, with consistent JSON error diagnostics.
  • Validation warns about ambiguous task numbering in spec-driven changes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 5e3db956-42bf-432e-ae12-d908b5127fc3

📥 Commits

Reviewing files that changed from the base of the PR and between 0221ac3 and 5e016e4.

📒 Files selected for processing (6)

• .changeset/catchup-archive-requirements-blank-lines.md
• .changeset/catchup-cli-reject-missing-roots.md
• .changeset/catchup-config-picker-update-label.md
• .changeset/catchup-schema-fork-yaml-fidelity.md
• .changeset/catchup-schemas-canonical-root.md
• .changeset/catchup-validate-task-numbering.md

---

📝 Walkthrough

Walkthrough

Six patch changesets document existing behavior changes for archive spacing, CLI root validation, config-picker labels, schema YAML fidelity, canonical schema roots, and task-numbering warnings.

Changes

Patch release notes

Layer / File(s)	Summary
Archive and schema fidelity .changeset/catchup-archive-requirements-blank-lines.md, .changeset/catchup-schema-fork-yaml-fidelity.md	Documents blank-line preservation during archive rebuilds and YAML comment, scalar-format, and key-order preservation during schema forks.
CLI root and schema selection .changeset/catchup-cli-reject-missing-roots.md, .changeset/catchup-schemas-canonical-root.md	Documents existing-root requirements for bulk commands, canonical schema root selection, --store <id> support, --store-path rejection, and JSON diagnostics.
Workflow and validation notes .changeset/catchup-config-picker-update-label.md, .changeset/catchup-validate-task-numbering.md	Documents config-picker wording updates and task-numbering warnings across validation modes.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related issues

• openspec archive does not preserve blank lines around ## Requirements in the target spec #1625 — Covers the archive blank-line preservation bug documented by one of the changesets.

Possibly related PRs

• Fission-AI/OpenSpec#1437 — Implements the behaviors documented across several changesets.
• Fission-AI/OpenSpec#1523 — Implements the task-numbering warnings documented here.
• Fission-AI/OpenSpec#1612 — Implements the missing-root behavior documented here.

Suggested reviewers: tabishb, alfred-openspec

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the six changesets added for previously untracked v1.9.0 fixes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch changeset/v1-9-0-catchup

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[alfred-openspec]

All six source PRs are merged, the catch-up entries preserve the original contributor credits, and a fresh Changesets dry run keeps the release at v1.9.0. Full CI is green. Tiny non-blocking description nit: the generated release currently contains 16 changesets, not 17.