What

Audit every stub, placeholder, TODO, and partial protocol implementation in network_system, then classify each as production, experimental, test-only, or remove.

Part of kcenon/common_system#684 and #964.

The 2026-05-21 analysis found placeholder/stub markers in protocol-heavy areas, including HTTP/2 library stubs and DTLS/TLS TODO paths. This issue should turn that loose signal into an explicit support matrix.

Why

network_system exposes multiple protocol libraries (network-tcp, network-udp, network-websocket, network-http2, network-quic, network-grpc). Consumers need to know which modules are production-supported and which are structural placeholders or experimental surfaces. That is especially important before v1.0 freeze language is finalized.

Where

• include/kcenon/network/**
• src/**
• libs/network-*/*
• docs/protocols/**
• README.md feature matrix
• CHANGELOG.md if support status changes

How

Approach

1. Run a source audit for TODO, FIXME, HACK, stub, placeholder, and not implemented across headers, sources, examples, and tests.
2. Build a table with path, symbol/module, current behavior, classification, and disposition.
3. For each production row, add or verify tests proving the behavior is real.
4. For each experimental row, document it in README/docs and ensure names or docs make the status explicit.
5. For each test-only row, keep it out of public documentation and release notes.
6. For each remove row, open a focused cleanup issue or PR.

Acceptance Criteria

• Support-status table committed or posted in this issue
• README protocol feature matrix reflects the audited support status
• Public headers do not expose undocumented placeholder behavior
• Any production-classified protocol has at least one unit or integration test exercising non-happy-path behavior
• Follow-up issues are opened for rows classified as remove or must-fix
• [EPIC] Ecosystem hardening follow-up from 2026-05-21 analysis common_system#684 receives the final support-status summary

Verification

• rg -n -i "TODO|FIXME|HACK|stub|placeholder|not implemented" include src libs results are either eliminated or explicitly accounted for in the audit table
• Relevant protocol tests pass on the standard CI preset