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sica-fondt/docs/plans/D2-medium.md
Claude b82e4e9833
ichor(D2): fix package docstrings so it compiles; verify green 
Pony allows one package docstring per package — collapse the four secondary
files' leading docstrings to // comments. ichor now compiles on ponyc 0.64.0
and the smoke wiring runs green (internal perfused, external rejected at D1,
cross-organ delivered). Update README + D2 status to reflect it builds; ignore
build/.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hmgREHNsxYCuim33yUF2c
2026-06-18 14:32:38 +00:00

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D2 — The medium / "the blood" (DESIGN-FIRST)

1. Component

The perfusion bus the organs share — what circulates between Brain and periphery. The architecture is explicit that organs communicate by perfusion, not direct wiring; this is that medium. Currently unnamed and unimplemented.

2. Status / certainty

SCAFFOLD · named Ichor, Pony scaffold at src/ichor/ (envelope + broker + D1 barrier + C seam). Compiles & runs on ponyc 0.64.0 (smoke wiring green). Backing/transport now C3.

3. Language & location

Pony (src/ichor/) — actor-model broker; capabilities give data-race-free sends. Transport split: Pony actors = the broker (hosted on the D1 barrier) + C/Fortran for the Ada-side binding (ichor_ada_shim.c). Cross-language organs (R/Octave/Ada/Guile) connect to the broker.

4. Does / does-not

  • Does: carry organ secretions/injections between organs, always through Ada (D1) before reaching the Brain.
  • Does-not: police (D1), enrich (organs), or hold state (storage E*). It is transport, not gate.

5. Interface contract (proposed)

  • A typed envelope { from_organ, to, payload, provenance } every organ emits/consumes.
  • All cross-language organs (R Drive-Box, Octave ETR, Ada border, Guile mini-rag) speak this one shape → this is what makes the polyglot body interoperate without bespoke per-pair wiring.

6. Dependencies & stubs

Everything rides it; nothing it depends on. Stub today: in-process function calls + canned envelopes (which is exactly how the per-organ specs stub their I/O now — the medium formalizes those stubs).

7. Invariants / laws

  • L1 (C5): perfusion, not direct wiring — no organ holds a hard reference to another's internals.
  • L2 (C5): everything reaching the Brain crosses Ada (D1) first.
  • L3 (C1): envelope carries provenance (so D1 can enforce its provenance laws).

8. Build steps

  1. Name it + choose transport. 2. Define the envelope. 3. Replace the per-organ in-process stubs with real medium calls, one edge of the DAG at a time (start R↔Octave for the Drive-Box, A8/A1).

9. Tests

Round-trip an envelope between two stub organs; assert it passes through a D1 admit check; provenance preserved.

10. Open items

  • The name (Ichor). Transport choice (Pony broker + C/Fortran Ada seam).
  • Build ichor_ada_shim.c into libichor_ada + wire Barrier.admit to Ada Trust_Guard (needs ponyc).
  • Socket layer for out-of-process organs (in-process routing works today). Whether RDE drives idle-perfusion (C1).