Before this change the bridge and the router both owned engage_mode
policy. Bridge's shouldEngage had a full switch over mention /
mention-sticky / pattern + source-based rules + engage_pattern regex
test + ignored_message_policy accumulate fallback. Router's
evaluateEngage had the same switch against the same fields. Two
parallel logic paths with subtle vocabulary differences (bridge: "which
SDK handler fired"; router: "what isMention says"). Every time we
touched one we had to reason about the other — the Telegram
hasMention bug and the "pattern mode silently drops in group chats"
bug were both drift between the two.
Refactor to one place. Router keeps all per-wiring policy — engage
mode, pattern regex, sender scope, ignored-message policy — unchanged.
Bridge drops to a coarse flood gate + subscribe signal:
- forward: does this channel have ANY wiring? Forward if yes.
Unknown channels still forward for subscribed/mention/dm (they may
be newly auto-created, or will trigger the coming
channel-registration flow). Unknown channels DROP for new-message
so we don't flood from every unsubscribed thread the bot happens
to sit in.
- stickySubscribe: any mention-sticky wiring on the channel AND the
source is mention or dm. Coarse union — subscribe is idempotent
and one call serves every sticky wiring.
The `text` param on shouldEngage is gone (pattern regex lives in the
router now). Four bridge handler sites simplify accordingly. messageToInbound
still carries the SDK-confirmed isMention flag through to the router
unchanged.
Behavioral delta: pure-mention-wired channels (no pattern, no
accumulate) will now see every plain group message reach the router
before being dropped there, where before the bridge dropped at the
transport boundary. Extra DB lookup per dropped message in this
specific case; acceptable for the cleaner seam and can be optimized
back at the bridge if it ever matters in practice.
Bridge tests prune the 10 engage_mode-specific cases that covered
logic now owned by evaluateEngage in the router (host-core.test.ts
covers it end-to-end through routeInbound). Bridge tests keep only
what's bridge-specific: the flood gate and the stickySubscribe
coarse union.
172 tests pass (was 182 — net -10 redundant bridge tests).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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