Scaffold: community VC7 codec firmware (empty, Phase 0 pending)

Empty project skeleton + README laying out the wax-and-feathers
rationale (VC7 is programmable silicon sitting unused; YouTube's
VP9 / AV1 codecs map to Pi 5's biggest energy cost; higgs is
battery-powered; saving electrons saves the planet — at least
that seems to be consensus).

Includes:
- README.md with rationale, scope (in/out), conventions,
  5 Phase-0 open questions, layout, sibling-project orbit.
- docs/dev_process.md (mirror of feedback_dev_process.md).
- src/, tests/ empty placeholders.

No build system yet. No PKGBUILD. Phase 0 not started.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,9 @@
+# Build artifacts
+build/
+*.o
+*.elf
+*.bin
+*.lst
+# Editor
+*.swp
+.DS_Store