docs(conventions): rulings and facts the convention pages have not caught up with #2557

From the 2026-11-01 conventions audit, re-verified on 73add05a3. index.rst: a ruling answered in a thread is written onto the page that covers it in the change that implements it, and each ruling names where it was settled.

• utilities-or-corekit.rst: no page records fix(protocols): convert capture timestamps without the platform's fromtimestamp limits (#2099) #2111 (pcapkit.utilities.compat holds backports and re-exports only; a platform-independent helper such as fromtimestamp gets its own module, which is why pcapkit/utilities/datetime.py is not in it). compat.py opens with imports and no docstring. The fix(utilities): fall back to the default threading excepthook before Python 3.10 (#1691) #1701/fix(const): give the AppType registry dict union only where dict has it (#1694) #1703 half is already pinned by a test.
• protocol-layer-placement.rst, subpackage table: the misc row reads "file formats and layerless sentinels", but pcapkit/protocols/misc/checksum/ip_pseudo.py IP_Pseudo (layer=None) lives there, by a ruling on feat(protocols): add the IP_Pseudo pseudo-protocol for the IP pseudo-header (#2471) #2479's thread (pseudo-header protocols go in misc under a checksum submodule; it closes Pseudo-protocol class for the IP pseudo-header (checksum/integrity groundwork) #2471).
• protocol-layer-placement.rst, internet row and "Routing Protocols": "confines it to IP, ICMP and IGMP", while pcapkit/protocols/internet/ also holds IPX and the IPsec and IPv6 extension headers that extension-header-subclassing.rst accepts. The placement is right; the wording reads as a closed list.
• reassembly-integration.rst, intro: "the owner's ruling, on this session's DTLS reassembly work" names no thread. The ruling is on fix(reassembly): pin DTLS handshake buffers at declared message length #2469 (follow the RFC) and on feat(foundation): reassemble fragmented DTLS handshake messages #2451's thread (integration; it closes DTLS handshake-fragment reassembly #2440).
• protocol-family-grouping.rst: the sentence that AH and ESP are selected by IPsec and IPv6_Ext holds for IPv4-carried headers only. On Ethernet:IPv6:AH, 'AH' in frame, 'IPsec' in frame and 'IPv6_Ext' in frame are all False (the headers fold into IPv6.extension_headers); only frame.protochain has them.
• mint-criterion.rst, "Cache in the value table only" and the AST-walk note: ftp.command.CommandType is an IntFlag registry whose _missing_ range-checks 0..0x07 and then calls super()._missing_, so it behaves like Flags and belongs with them.

Fix: write each ruling onto its page, citing the issue it was settled on, and correct each misstated claim.
Blocked: #2528 edits reassembly-integration.rst; #2537, #2540, #2542 and #2544 edit protocol-family-grouping.rst. Unblocks when all five merge (gh pr view <n> --json state -q .state prints MERGED).