docs: correct DV routing, CLI flags, and source map against 4.6.3

[superuser404notfound]

Audited the README and docs/{architecture,formats,cli}.md against the actual sources at HEAD (4.6.3) and fixed the drift found. Docs-only, no code changes.

formats.md (the biggest miss: Dolby Vision signaling)

• DV routing table no longer collapses P5 / P8.1 / P8.4 under "dvh1 / dvhe". Reality per CodecRoutePolicy.swift: P5 emits a bare dvh1 primary; P8.1 / P8.4 / P7 emit hvc1 primary + dvvC with dvh1.08/db1p or /db4h in SUPPLEMENTAL-CODECS on DV panels, plain HDR10 / HLG base elsewhere. dvhe is never emitted.
• AV1+DV corrected: P10.0 / P10.1 are bare dav1 with no supplemental; only P10.4 carries the dav1/db4h supplemental.
• Documented the SDR-compatible-base profiles (HEVC P8.2, AV1 P10.2) that strip the DV config and play the Rec.709 base on every panel.

cli.md

• "Fifteen subcommands" was off by one (sixteen).
• hlslive --segments is a required comma-separated list of .ts paths, not a numeric sizing flag; clarified --seconds / --segment-seconds / --disc.
• serve --native-subs: the <index> value is legacy and ignored; the flag drives requestNativeSubtitleTrack() + attachAllNativeSubtitleStores(), not LoadOptions.prepareNativeSubtitles.
• Added the undocumented flags: live --serve-only / --rewind-test / --gen-highbitrate-seed, and customio --audio-only.

architecture.md source map

• Added the omitted files: DiscRecognitionCache, HTTPDiscIOReader, MovTextSampleBuilder, NativeSubtitleCueStore, DoviRpuConverter+Probe, Issue65LivelockBreakers.
• Added the AetherEngineSMB target subtree and a pointer to cli.md for the aetherctl target.

README.md

• Audio bridge row now lists DTS-HD MA.
• Documented LoadOptions.nativeRemoteHLS for AVPlayer-native remote HLS.

Each claim was verified against the cited source (CodecRoutePolicy.swift, Serve.swift, HLSLiveRepro.swift, main.swift, the Sources/ tree). All cross-doc anchors and file links resolve; no broken references.

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