chat: steer replies back through rt chat

[m4ttheweric]

What

The cross-session envelope (#131) collapsed the terminal rendering but imported the host's peer-message semantics: agents dismissed the welcome as "another session's ambient sign-in" and replied to chat messages via SendMessage (the host's suggested channel) instead of rt chat post/dm.

How

• Per-delivery reply steer: one trailing line inside every wrapped delivery (REPLY_STEER in lib/daemon/inbox.ts): reply via rt chat post/dm, never SendMessage. One line per delivery, not per message in a batch.
• Welcome reframe: opens with "This frame is for THIS session, from the rt daemon (not another agent)" and adds the never-SendMessage line to the reply contract.
• SKILL.md: names the framing honestly (the host label is the transport, not the sender) and bans sidestepping chat via ListAgents+SendMessage for signed-in agents. Edited under superpowers:writing-skills: forms matched to the observed failures (positive reframe for the misattribution, recipe-first steer for the channel reflex), live GREEN verification with a throwaway pane gates "done" after deploy.

(A fourth leg lives outside this repo: a global ~/.claude/rules/prefer-rt-chat.md so every session boots with the channel rule.)

Tests

Delivery assertions updated to carry the steer line (kept as a literal in the test so drift in the shipped line fails loudly); unit suite green; e2e chat-inbox-delivery 2/2 against a real daemon and socket.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between c6afe65 and ca1d685.

📒 Files selected for processing (7)

• e2e/tests/chat-inbox-delivery.test.ts
• lib/__tests__/repo-index.test.ts
• lib/daemon/__tests__/chat-delivery.test.ts
• lib/daemon/handlers/chat.ts
• lib/daemon/inbox.ts
• lib/repo-index.ts
• skills/rt-chat/SKILL.md

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_{Comment @coderabbitai help to get the list of available commands.}

[m4ttheweric]

Note: the full suite carries one pre-existing failure on main (reposPrune: "removes a renamed repo's retired name...", commands/tests/repos.test.ts:256) — reproduced identically on a clean main checkout, unrelated to this branch. Chat suites + e2e are green.