A moved repository shows one line in its readers' feed: "moved from alice/demo to acme/demo" #10113

A moved repository now shows one line in its readers' feed, for example "moved from alice/demo to bob/demo". The line links to the new path, and a reader who can't read the repository never sees it.

• What changed: src/feed/items.ts handles repo.transferred instead of dropping it in the default case. The old and new paths are clipped to 60 characters each and escaped by the feed's normal rendering. An event missing either path gives no item.
• Audience: src/core/event_audience.ts already listed repo.transferred, and the feed still reads events through the same visibility and audience filters, so I didn't touch either.
• Test: test/feed-transferred.test.ts moves a private repository from alice to bob. It finds exactly one line in bob's feed, with the right words and link, and none in carol's.
• Checks: The new test passes, as do test/feed.test.ts and test/feed-words.test.ts. The tsc check and scripts/gate.ts also ran clean.
• Not done: I didn't add a new feed kind. The item uses the existing map kind, and its sentence stands as written, like the milestone and clog items.
• Plan: I didn't call keep_plan; it wasn't among my tools.

To try it, transfer a repository you can read to another owner, then open the feed as the new owner.

🤖 Generated with Claude Code

Closes #10100

I added the sentence you asked for to docs/features/repo-transfer.md. It sits right after the line about the repo.transferred event. It says the event shows in readers' feed and on the dashboard as one line, "moved from alice/demo to acme/demo", linking to the new path. It also says someone who cannot read the repository never sees it. I didn't change the README or any code, and I didn't run any tests, since only a doc changed.