docs(fusa): [c-RCP-18-tracker Part 1] propagate tc18_master_id for REQ-DISC-*/REQ-L2-*/REQ-UDP-*

[SoundMatt]

Summary

Part of the wiggly-shimmying-wombat effort's cpp-RCP Part 1 pass. This batch scoped the ~31 remaining unlinked-or-partially-linked prefixes (ADMIN, AUTH, CAPI, CFG, CLI, DDS, DISC, DL, DOIP, DYN, ERR, FI, GRPC, L2, LOAN, MDNS, MOCK, MQTT, OBS, REC, RED, RELAY, REST, RL, SHMEM, SIM, SOMEIP, TLS, TSN, UDP, UDS) by reading each package's own doc comment / requirement text, mirroring the scoping exercise go-RCP already completed for its own remaining prefixes.

28 of 31 prefixes confirmed non-TC18 by their own doc comments: protocol-bridge stubs (DDS/DOIP/GRPC/MQTT/REST/SOMEIP/UDS — all explicitly errc::function_not_supported stubs, ADAPTed per ROADMAP milestone 59, "translating between an RC Client's application-level view and X is conceptually unaffected by which wire protocol RCP itself now speaks"), cross-cutting auxiliary tooling (ADMIN/AUTH/CAPI/CFG/CLI/DL/DYN/FI/LOAN/MDNS/MOCK/OBS/REC/RED/RL/SHMEM/SIM/TLS/TSN), and the RELAY-sentinel error-code shape assertions (ERR — same disposition go-RCP found for its own REQ-ERR-*, confirmed here: ErrClosed/ErrNotFound/ErrZoneMismatch truthiness/distinctness, not TC18 spec text).

3 prefixes are genuinely TC18-scoped, with mixed results:

• REQ-DISC-* (rcp/discovery.hpp) — implements TC18 §12.6/§12.6.1/§12.7.4 discovery-request/response framing and stream-contention-claim behavior directly. 8 of 9 linked to previously-unclaimed master-catalog entries. REQ-DISC-008 (error-category shape assertion) stays unlinked — own error-code infra, not spec text.
• REQ-L2-* — mostly a master-catalog coverage gap: TC18 §10.1 (EtherType 0x22F0 framing) has zero catalog entries (the catalog only covers sections 11–13), matching go-RCP's identical finding for its own L2 package. One exception: REQ-L2-007 cites §12.9.1.1 (multi-request-per-frame), which is in catalog scope — linked to TC18-12.9.1.1-001. This also corrects a pre-existing wrong-line citation on REQ-L2-007 (was TC18.txt L3220, a §12.7.7 register table; the actual quote lives at L3617).
• REQ-UDP-* — same catalog-gap situation as L2: Annex J UDP/IP encapsulation is entirely outside the catalog's §11–13 scope. One exception: REQ-UDP-011's byte_bus_id/transaction_num response-correlation logic is a disciplined, near-verbatim match for TC18-12.9.1-010's MUST clause.

id → master-catalog-id mapping

id	master_id	basis
REQ-DISC-001	TC18-12.6.1-001	Table 18 discovery-request fields (byte_bus_id=0, op=1 read)
REQ-DISC-002	TC18-12.6.1-002	TSCF-headed/ACF_GBB discovery requests dropped without response
REQ-DISC-003	TC18-12.6-003	first discovery request in HW_UNCONFIGURED/HW_CONFIGURED sets the discovery stream
REQ-DISC-004	TC18-12.6-003	stream dropped after Discovery_TimeOut with no config activity
REQ-DISC-005	TC18-12.6-003	non-first requesters still get server_config map response
REQ-DISC-006	TC18-12.6-003	configuration requests from non-claim-holders rejected with error response
REQ-DISC-007	TC18-12.7.4-001	discovery-based reconfiguration disallowed once RCP_CONFIGURED
REQ-DISC-009	TC18-12.6-002	discovery answered in any lifecycle state
REQ-L2-007	TC18-12.9.1.1-001	multi-ACF-type-per-AVTPDU framing (citation-line correction)
REQ-UDP-011	TC18-12.9.1-010	response/ack associated to request by byte_bus_id + transaction_num

REQ-DISC-008 deliberately left unlinked (own DiscoveryErrc category/message-shape assertion, not spec text).

cpp-RCP is now at 123/376 requirements linked (up from 113/376).

Verification

• CMake+Ninja Release build: 0 errors
• ctest --output-on-failure -j1: 53/53 passing
• cpfusa check: 0 errors / 2 warnings / 1 info (unchanged from PR docs(fusa): [c-RCP-18-tracker Part 1] propagate tc18_master_id for REQ-E2E-*/REQ-REGMAP-*/REQ-SEQ-* #112 baseline)
• cpfusa trace --format json: coverage 376/376/376/64 (unchanged)
• git diff --stat: only .fusa-reqs.json changed
• Freshness: branched from origin/main @ 8033cdb (PR docs(fusa): [c-RCP-18-tracker Part 1] propagate tc18_master_id for REQ-E2E-*/REQ-REGMAP-*/REQ-SEQ-* #112 tip), re-fetched immediately before push — no new commits landed

Left for a future batch: none of the remaining ~28 prefixes appear to have further TC18-scoped content beyond what's captured here — cpp-RCP's Part 1 propagation effort appears at or near completion pending independent review of this PR's judgment calls (esp. the TLS/RL/TSN non-TC18 calls, and the L2/UDP catalog-gap findings).

Signed-off-by: Matt Jones 47545907+SoundMatt@users.noreply.github.com