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RFC: Migrate from tape to vitest (#9966)

* RFC: Migrate from tape to vitest

Proposes replacing tape (assertions) + ocular-test (runner) with vitest.
See dev-docs/RFCs/proposals/vitest-migration-rfc.md for full details.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* RFC: Add multi-environment architecture and expanded implementation plan

- Add vitest workspace configuration (node/browser/headless projects)
- Clarify entry points: browser as source of truth, node as smoke test
- Add Playwright rationale (required by vitest browser mode)
- Expand Phase 4 with discovery mechanism for browser-only tests
- Add detailed Phase 5 for snapshot/interaction test migration
- Add Verification section with test commands
- Update risks table with new considerations

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

* RFC: Add @deck.gl/test-utils deprecation timeline

- Add 3-phase deprecation plan (9.3.x → 9.4.x → 10.0.0)
- Include migration guide for external consumers
- Resolve open question #3 about tape deprecation timeline

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

* RFC: Update CLI commands and finalize Phase 4 discovery outcome

- Flip file naming: *.node.spec.ts (node) vs *.spec.ts (browser)
- Change to vitest.workspace.ts with defineWorkspace
- Add CLI command mapping and matrix tables
- Document Phase 4 outcome: ~95% tests need browser
- List node smoke tests (2 files) and excluded tests

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

* RFC: Add injectable spy API, Phase 5 outcome, and Phase 7

- Add injectable spy API for framework-agnostic test-utils
- Document backward compatibility with lazy probe.gl fallback
- Add Phase 5 outcome: browser commands, test runners migrated
- Document interaction tests passing, render tests need work
- Add Phase 7: future benchmark and size test migration
- Update Phase 6 cleanup with specific .ocularrc.js items

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

* RFC: Update peer dependencies - probe.gl... (continued)

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