docs: reconcile RFC coordination index with shipped reality

[GarthDB]

Description

Reconciles docs/rfc-coordination.md (the RFC "living index") and its two sibling
docs with what has actually shipped, and updates the five GitHub RFC discussions
whose status blockquotes had drifted out of sync with the index.

• docs/rfc-coordination.md: flip Phase B (foundation-corpus write path) from
  "next open gate" to shipped (epic spectrum-design-data-122, closed); add
  RFC-E (Component/Token Relationships) and RFC-F (Guidelines/Phase 10) rows; add
  a draft-RFC row for [DRAFT RFC] Platform Coverage Metrics via Manifest Adoption #1324; reference 6 previously-orphaned spec files; refresh
  the Token Taxonomy, Vocabulary, and Formatting — Naming Convention Decomposition #806/[DRAFT RFC] Token Deprecation and Consolidation #623/[DRAFT RFC] Token Authoring Workflow and Process #625/[RFC-A] Component Contract in Design Data Spec #832 rows with rules and PRs shipped since the last update.
• packages/design-data-spec/spec/authoring-workflow.md: flip Phase B (token
  lifecycle ops, mode-set management) from "not yet shipped" to shipped; clarify
  write_component remains unscheduled (out of Phase B's scope).
• docs/token-studio-sunset.md: mark Phase 1 (foundation-corpus write target)
  done, unblocking Phase 2.
• GitHub discussions [DRAFT RFC] Spectrum Design Data Specification #714, [RFC-A] Component Contract in Design Data Spec #832, [DRAFT RFC] Token Authoring Workflow and Process #625, [DRAFT RFC] Token Deprecation and Consolidation #623, Token Taxonomy, Vocabulary, and Formatting — Naming Convention Decomposition #806 — updated each discussion's
  dated Status: blockquote to match the refreshed index, per the doc's own rule
  that the index and discussions move together.

Related Issue

N/A — documentation reconciliation, not tied to a single issue.

Motivation and Context

The coordination doc is meant to be updated in the same PR that lands a change,
but several months of shipped work (Phase B, CTR, guidelines) had landed without
it, leaving the index unable to be trusted as an entry point. This makes the
three docs and the five affected discussions consistent with shipped reality
again.

How Has This Been Tested?

• node tools/changeset-linter/src/cli.js check --fail-on-warnings passes.
• Verified every file in packages/design-data-spec/spec/*.md is referenced by
  the coordination doc.
• Verified every SPEC-XXX id cited in the doc exists in rules.yaml.
• Cross-checked Phase B shipping claims against the closed beads epic and the
  actual cascade write-path code (sdk/core/src/write.rs, CLI/TUI/MCP call
  sites) before flipping any status language.

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Docs-only change (patch changeset for @adobe/design-data-spec).

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[changeset-bot]

🦋 Changeset detected

Latest commit: ec5f852

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@adobe/design-data-spec	Patch

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[github-actions]

Run report for ec5f8522

Total time: 139.9ms | Comparison time: 110.7ms | Estimated loss: 29.2ms (20.8% slower)

	Action	Time	Status	Info
⬛️	SetupProto(0.57.4)	0ms	Skipped
🟩	SyncWorkspace	10.7ms	Passed
🟩	SyncProject(design-data-spec)	0.7ms	Passed
⬛️	SetupToolchain(node:20.17.0)	12.1ms	Skipped
⬛️	SetupToolchain(pnpm:10.17.1)	2.2ms	Skipped
⬛️	SetupToolchain(javascript)	0ms	Skipped
🟩	SetupEnvironment(javascript)	0.5ms	Passed
⬛️	InstallDependencies(javascript)	6.5ms	Skipped
🟩	RunTask(design-data-spec:check)	107.6ms	Passed

Changed files

.changeset/reconcile-rfc-coordination-docs.md
docs/rfc-coordination.md
docs/token-studio-sunset.md
packages/design-data-spec/spec/agent-surface.md
packages/design-data-spec/spec/authoring-workflow.md

[github-actions]

🎨 Token Changes Report

Tokens Changed (0)

Original Branch: main

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[github-actions]

🧩 Component Schema Changes Report

No component schema changes detected.

This comment was automatically generated by the component schema diff tool. 🤖