stagent v0.8.0

Added

• Pushes can go to Discord, Slack and Telegram: notify.chat {enabled, url}, a chat destination next to the generic webhook (both can be on
  and both get every push). The one-line url names the service — a
  Discord webhook (https://discord.com/api/webhooks/<id>/<token>,
  discord://<id>/<token>), a Slack Incoming Webhook
  (https://hooks.slack.com/services/…, slack://<a>/<b>/<c>) or a
  Telegram bot and chat (tgram://<bot token>/<chat id>) — and stagent
  builds each service's message itself: the reason's emoji, the
  host-labelled title and the body, as a Discord embed (yellow for a
  warning, no mentions), Slack text (&<> escaped, no unfurling) or
  Telegram plain text (no link preview). config.set refuses any other
  url, Slack Workflow webhooks included, with bad_request. The url
  is a secret: it never shows in last_error (channel chat),
  notify.test errors, stagent doctor or the log. The bridge announces
  push_chat (#471).
• notify.test {channels?: ["ntfy" | "webhook" | "chat"]} tests only the
  channels named; without channels, every enabled one as before. An
  unknown name is bad_request, named channels that are all off
  not_configured (#471).
• notify.click_page: the open page (https://sshterm.iru-yo.com/open,
  set by the app) that chat destinations and the generic webhook link to,
  with h=<host_id> and s=<session id> in its fragment
  (<click_page>#h=…&s=…). A push of one session gets an "Open in SSH
  Term" link (in notify.lang): a link button on Discord
  (?with_components=true) and Telegram (inline keyboard), a link at the
  end of the text on Slack; a digest, notify.test and a push of no
  session get none. The generic webhook's JSON gains click_url (the
  host only, #h=…, for a digest and notify.test); its other keys stay.
  No click_page, no link. ntfy's Click still uses notify.click_base.
  config.set refuses a click_page that is not an absolute https URL
  without query and fragment with bad_request (#472).
• On Discord and Telegram, the chat destination replaces and resolves
  like ntfy: the next message of a session is sent first, then the
  older one deleted (Discord DELETE …/messages/<id>, Telegram
  deleteMessage; one Telegram no longer deletes after 48 hours is
  marked resolved instead), and when the session settles its message is
  edited, not deleted: ☑️ in place of the reason's emoji, "(resolved)"
  after the title in notify.lang (ja （解決済み）), the body as it
  was and the same "Open in SSH Term" button (Discord: grey embed,
  components sent again; Telegram: editMessageText with reply_markup
  sent again). A digest's message is marked resolved once all its
  sessions have settled and is never deleted by a later message of one
  of them. The unresolved messages survive a daemon restart in
  state/chat-messages.json (mode 0600: ids, sent time and the SHA-256
  of notify.chat.url, never the URL or its token); a session gone over
  the restart has its message marked resolved at once. Changing
  notify.chat.url or removing chat forgets the messages of the old
  URL without editing them. A failed delete or edit is never retried nor
  a failed push (last_error): a 404 lets the message go, a 429 or a
  connection error lets it go with one log line. Slack messages are only
  sent, and the generic webhook still gets no clear (#473).
• A failed push to the chat destination says why: last_error.chat gains
  kind (revoked, unreachable, rate_limited, rejected, server,
  network; Telegram by error_code) and its error adds the service's
  short reason after the status line (404 Not Found: Unknown Webhook (10015); Discord's message and code, Telegram's description,
  Slack's error body; 200 characters at most, dropped whole if it holds
  the URL or a token). A queued push answered 429 with a wait of 5 s or
  less is sent once more after the wait (notify.test is not); only a
  failed resend is recorded. Pushes keep going after a failure, and the
  log shows only the first of a run of the same kind. config.set
  changing notify.chat.url removes last_error.chat; stagent doctor
  names the kind and, for revoked, says to set a new URL from the app
  (#474).

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stagent 0.8.0 — server binary for SSH Term. Built from this tag (00e7220) with go1.27.1 via scripts/release.sh (reproducible: CGO_ENABLED=0, -trimpath, no VCS stamp, empty build id); verify downloads against SHA256SUMS.