chore: comprehensive documentation cleanup for v0.2.1

[bbopen]

Summary

Comprehensive documentation cleanup addressing issues identified during v0.2.1 release review.

Stale Documents Removed

• Delete ROADMAP.md (all items completed via ADR-0001)
• Removed untracked docs/adr/0001-unified-bridge-core.md locally
• Removed untracked docs/tasks/unified-bridge-core.md locally

Pyodide Version Consistency (v0.24.1 → v0.28.0)

Aligns all Pyodide URLs with the >=0.28.0 peer dependency:

• src/runtime/pyodide-io.ts - DEFAULT_INDEX_URL
• README.md - browser example
• docs/runtimes/browser.md - examples
• docs/getting-started.md - example
• docs/configuration.md - example
• test/runtime_pyodide.test.ts - expectations
• test/runtime_config.test.ts - expectations

CONTRIBUTING.md Fix

• Fix Python version requirement: 3.12+ → 3.10+ (matches CI matrix which tests 3.10, 3.11, 3.12)

type-mapping-matrix.md Improvements

• Remove false "automatically updated" claim
• Fix year: 2024 → January 2026
• Add Pydantic v2 BaseModel documentation
• Fix torch.Tensor to show nested ndarray envelope structure

configuration.md Fix

• Remove duplicate "Development Options" header (was at lines 258 and 269)

Test plan

• npm run build && npm run typecheck passes
• Pyodide-related tests pass: npx vitest run test/runtime_pyodide.test.ts test/runtime_config.test.ts
• No remaining v0.24.1 references: grep -r "0.24.1" docs/ README.md src/ test/

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📥 Commits

Reviewing files that changed from the base of the PR and between b2071bf and 2bf7db3.

📒 Files selected for processing (10)

• CONTRIBUTING.md
• README.md
• ROADMAP.md
• docs/configuration.md
• docs/getting-started.md
• docs/runtimes/browser.md
• docs/type-mapping-matrix.md
• src/runtime/pyodide-io.ts
• test/runtime_config.test.ts
• test/runtime_pyodide.test.ts

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[bbopen]

TODO in future PR: automate generation of this file.

[bbopen]

lgtm