docs(changelog): second whole-repo pass over the changelog (#1103)

[JarryShaw]

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• You will be asked some questions, please read them carefully and answer honestly

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• Followed the coding style (make pylint, make mypy, make isort)

• make test passes, and a test case covers the change. Narrow runs only, listed below.

• Added a changelog entry under docs/source/changelog/ and regenerated CHANGELOG.md, if the change is user-visible: N/A — centralised in docs(changelog): shared 1.5.0 changelog — long-lived, merges last (#610, #616, #617, #618, #620) #657

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Summary

#1103 second whole-repo pass, changelog slice.

Entries:

• add fix(protocols)!: keep pack() from rewriting the instance it is called on (#1769) #1791 (breaking: pack() leaves its instance unchanged), fix(protocols): export Protocol from pcapkit.protocols.protocol (#1770) #1778
  (Protocol in protocol.all), fix(corekit): resolve PortEnumField misses for any proto; restate its peek (#1774) #1781 (PortEnumField miss with a
  nameless proto), fix(vendor): make the public-API sweep cover pcapkit.vendor (#1772) #1779 (vendor.ipx _path), chore: drop stale build leftovers and move the examples' READMEs to Markdown (#1773) #1780 (examples READMEs to
  Markdown, build leftovers) and docs(conf): resolve the 36 ambiguous cross-references at their source #1790 (36 ambiguous cross-references)
• fold test: exercise option type 0x23 in the SMF_DPD truncation loop (#1771) #1776 into the RPL 0x23 entry and fix(dumpkit): JSON output of DPKT/Scapy frames grows without bound and fills the disk #1381 into the dump-schema one

Accuracy:

• the benchmark and legacy_smoke READMEs are README.md since chore: drop stale build leftovers and move the examples' READMEs to Markdown (#1773) #1780
• EngineBase stays out of all, as fix(foundation): registrar error messages and type hints name the public class, not the Base the guard checks #1016 settled
• the Profile by self time: aenum.extend_enum is 16.7% of extraction, dispatch and imports under 1% #575 peek calls get() only once the value resolves
• the the generated enum guards raise a bare ValueError in 113 of 117 const modules, and tcp.flags.Flags has no guard at all #647 and fix(reg)!: reject an out-of-range port in AppType.get, and claim each span by transport #764 entries point at Registries mint a permanent member for every unrecognised value: 1,169 extend_enum sites across 113 registries #775/const: bring the 16 bespoke registries onto EnumRegistry, after fixing the base's str-key dispatch #860, under which nothing mints
• the refactor(const,vendor): apply the mint/unmint criterion ruling to 82 registries (#775) #861 entry names fix(const,vendor): bring 8 bespoke registries onto EnumRegistry, stop them minting #869 and fix(const,vendor): bring the AppType family onto EnumRegistry, stop it minting (#860) #874 for the EnumRegistry move

Figures:

• preamble: 685 citations, Dev/test setup: sample capture generators, portable Makefile #340 to fix(protocols)!: keep pack() from rewriting the instance it is called on (#1769) #1791
• process.rst pin: 298 entries; CHANGELOG.md regenerated

Refs #1103

[JarryShaw]

Verdict: GOOD TO GO at 0ffba1f6a. A Sonnet cross-review (author: Opus) found no blocking findings. Scope stays inside the slice, the AST guard is identical against main, and every directive was checked against the release tags. The merged build of all nine second-pass heads has 18 warnings, the same as main. tests/project: 950 passed, 1 skipped, 3 warnings, 3670 subtests passed.