docs(openspec): archive complete frame transport

2026-08-10 08:54:36 +07:00
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+## Why
+
+The RC9 datagram contract limits one encoded media unit to 18,864 bytes, below the bounded complete frames required by the reviewed Apollo adapter and the fixed Phase 3C profiles. A new immutable Protocol release must define complete-frame transport and reassembly bounds before consumers can relay realistic encoded frames without mutation.
+
+## What Changes
+
+- Add a versioned PMTU-safe media datagram header with wider fragment fields.
+- Bound complete encoded frames, fragments, reassembly state, duplicates, reorder, timeout, and allocation.
+- Preserve RC9 datagram-v1 unchanged and require explicit negotiation of the new framing profile.
+- Add fixed Python, Go, Rust, and Swift conformance vectors for valid and malformed framing.
+
+## Capabilities
+
+### New Capabilities
+
+- `gateway-media-framing`: Versioned complete encoded-frame fragmentation and bounded reassembly contract.
+
+### Modified Capabilities
+
+None.
+
+## Impact
+
+Protocol framing documentation, registries, capability schema, fixed conformance fixtures, validators, generated Go/Rust/Swift bindings, and immutable consumer versioning. Requirements: SYS-002, SYS-003, P3C-006, P3C-007, P3C-008, P3C-030, P3C-038, VER-001, VER-002, VER-028.