Correct stale comments in focus-step, Door, peer-surfaces, the dor launchers, and PRODUCT.md

[dormouse-bot]

This PR corrects comments that no longer match the code or that point at the wrong spec. It changes no behavior. One test gains the assertion its title already promised.

• lib/src/components/focus-step.ts: the docstring named a "pane header context menu" as a stepFocus caller. No such caller exists. The real ones are the modal and popover focus traps, the terminal context detail, and the Workspace tab menu.
• lib/src/components/Door.tsx: the spoken badge comment pointed at docs/specs/layout.md. That spec defers to docs/specs/alert.md → Door, which is where the SPOKEN rule lives.
• lib/src/remote/burrow/peer-surfaces.ts: "attach-is-the-resize" does not appear in remote-api.md. The comment now cites the heading that states the rule, "Size authority: last-attach-wins".
• website/src/lib/playground-fs/viewers.ts: search is the raw url.search string that sw.js sends, not a URLSearchParams.
• dor/bin/dor and dor/bin/dor.cmd: the comments said DORMOUSE_NODE is always Electron. It is Electron only under VS Code; standalone passes a plain Node binary (docs/specs/dor-cli.md → Public PTY env), which ignores ELECTRON_RUN_AS_NODE.
• PRODUCT.md: removed the sentence calling "the current Catppuccin Mocha design" throwaway. Nothing in the tree uses Catppuccin anymore.
• lib/src/components/wall/tool-run-end.test.tsx: the test "keeps a user rename through the end, and drops a preview mark with the Tool" never checked the preview mark. It now asserts params is gone, the same way the neighbouring test does. It passes locally (16/16).

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