docs: reconcile README, design and harness docs with shipped behavior

[altaywtf]

Docs now match main at 493cf18: nine stale claims fixed, no new sections.

• README: TV Search and History results play media and open everything else in Files (#253); TV autoplay next (#259); mobile copies items shared with you (#275)
• design/README: phones turn to landscape only for a landscape video (#266); Captions hides under hide_subtitles (#261)
• behavior and harness: a shared media file on TV still offers Open in VLC (TvFilesAction.kt); TV buffer size is tv-native's fixed default, not a missing server key
• design-v3-discrepancies: TV file-row glyphs render ListItemDefaults.IconSize (32dp), not 21dp
• Checked unchanged: test and proof names, instrumentation args, constants, build and CI facts; relative links and anchors resolve. No doc check exists in verify

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Written by an agent (Claude Code, Opus 5.5)

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[Copilot]

Copilot review overview

🟢 Approval recommended

It is a documentation-only change and every reconciled claim was verified accurate against the current shipped code, with all cross-references resolving.

Review effort: Balanced
Findings: None

What changed in this PR

This PR updates documentation only (README, design docs, harness, and behavior references) to reconcile stale descriptions with behavior already shipped to main. It fixes nine out-of-date claims across five Markdown files without introducing new sections or code changes, following a series of recently merged feature PRs (#253, #259, #261, #266, #275).

Changes:

• README: documents TV autoplay-next, TV Search/History results playing media (else opening in Files), and mobile copy of shared-with-you items.
• design/README: corrects mobile fullscreen orientation (landscape only for landscape video) and the hide_subtitles Captions behavior.
• behavior/harness/design-v3 docs: clarifies TV shared-media Open in VLC, TV buffer-size rationale, and the TV file-row glyph size.

File	Description
README.md	Updates mobile Files copy, TV autoplay-next, and TV Search/History open behavior to match shipped code.
docs/​harness.md	Corrects the no-actions oracle wording and the TV buffer-size explanation, adding a resolving link to behavior.md#tv-playback.
docs/​design-v3-discrepancies.md	Replaces the stale 21dp/42px glyph note with the Compose-for-TV ListItemDefaults.IconSize (32dp) description.
docs/​behavior.md	Clarifies that a shared media file on TV still offers Open in VLC while other shared items open nothing.
design/​README.md	Corrects the phone fullscreen orientation rule and the hide_subtitles Captions behavior.

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