docs: draft workflow and zero-cost abstraction blog post

[avrabe]

Summary

• Documents the draft blog post workflow in CONTRIBUTING.md and CLAUDE.md (draft = true → zola serve --drafts → remove draft to publish)
• Adds draft blog post: "the Component Model as a zero-cost abstraction for safety-critical systems"
  • Landscape analysis: DLR avionics interpreter, Infineon AURIX AOT, wasmi
  • Pipeline walkthrough: meld → loom → synth → kiln + sigil
  • Honest assessment of what "zero cost" covers (structural overhead) and what it doesn't (resource handles, transcoding, async)
  • synth pluggable backend architecture (ARM Cortex-M first, extensible to TriCore, RISC-V)
  • Qualification implications for ISO 26262 / DO-178C
  • WIP caveat — we're building toward this, not claiming it

The blog post has draft = true — it won't appear in production builds.

Test plan

• zola build passes (2 pages, draft excluded)
• zola build --drafts passes (3 pages, draft included)

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