Instructions and docs match the code, without the kit's own rules

[Jackicus]

Fixes #101

The kit doctor pass. The repository was already on the kit (sync clean, make check in CI, main and release tags protected); this corrects what had drifted from the code and drops what the kit already says.

Corrected

• .claude/rules/tracking.md: the watched mark is written while a file plays (only the position waits); none writes neither file (it still reads the local one); resume uses SetPosition or Seek; playLabel comes from library.js normalizeShow, not the scan; library.js added to paths:.
• .claude/rules/layout.md: the full list of widgets that track hover.
• .claude/rules/keyboard.md: Home also waits for nothing to be modal.
• src/backend/CLAUDE.md: game roots are the two path settings, auto-detected only when empty; list is mediaScanner.js's.
• drive-extension skill: the nested display is library-menu-dev; under --stand-in the button is in the dash; an empty Games tab offers Find Games, which is a scan and joins "Never press".
• README.md: Import reads the file you pick; make logs follows both journals; the prefs' line is Scanner failed.
• docs/publishing.md: the stage copies only what ships; there is no check_pack.
• docs/private-api.md: the _canRemoveApp() override row; _overview.controls is also reached from panel.js and overviewPreview.js; whose _init builds the folder's parts.

Removed (the kit's): repeats of the nested-shell skill and gjs-st rules in the drive skill and /logs, /preview, /reload (start reuse, gsettings recipe, wait timings, keyboard walk, screenshot format, reload/logout rules); the commands' copies of the never-press list now point to the skill.

Verified: make check passes locally (lint, schema, scanner imports in a scratch home; size 8691 lines, 4% comments, 56 try). Docs only, so no nested shell.

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