fix(deadline): auto-extend implicit deadline to fit CDP ladder

config.default.toml

@@ -1,9 +1,23 @@
 [server]
 host = "0.0.0.0"
 port = 3000
+# Tower outer timeout. Issue #35: when
+# `request.auto_extend_deadline_for_ladder = true` (default), this baseline is
+# auto-widened at startup to cover the longest legitimate handler runtime
+# (auto-extended scrape, search enrichment fan-out, map's 300s ceiling). Set
+# this above 305s only if you also raised request.deadline_ms_default beyond
+# the default ladder_min.
 request_timeout_secs = 120
 rate_limit_rps = 10              # Max requests/second (global). 0 = unlimited.
 
+# [request]
+# deadline_ms_default = 8000
+# auto_extend_deadline_for_ladder = true
+#   Issue #35: when an implicit request omits `deadlineMs`, auto-extend the
+#   effective deadline to max(deadline_ms_default, ladder_min). Prevents
+#   chrome_timeout_ms = 30000 from appearing inert when deadline_ms_default
+#   is small. Set to false to enforce a strict SLO regardless of tier sizing.
+
 [renderer]
 mode = "auto"                     # auto | lightpanda | playwright | chrome | none
 page_timeout_ms = 30000

config.docker.toml

@@ -9,6 +9,13 @@
 # deadline yields a 264kb response. 15s is the budget that recovers the
 # stragglers without ballooning p50 on healthy pages.
 deadline_ms_default = 15000
+# Issue #35: when an implicit request omits `deadlineMs`, auto-extend the
+# effective deadline to `max(deadline_ms_default, ladder_min)` where
+# ladder_min = sum(per-tier timeouts) + N_cdp_tiers * 28s. Prevents
+# `chrome_timeout_ms = 30000` from appearing inert when this default is
+# small. Set to false to enforce the strict 15s SLO regardless of tier
+# sizing — explicit per-request `deadlineMs` always wins either way.
+auto_extend_deadline_for_ladder = true
 
 [server]
 # Disable global rps cap for benchmark + production load — the bench fires

crates/crw-core/Cargo.toml

@@ -9,6 +9,15 @@ keywords.workspace = true
 categories.workspace = true
 description = "Core types, config, and error handling for the CRW web scraper"
 
+[features]
+# Mirrors the `cdp` feature of `crw-renderer` / `crw-server`. When the
+# downstream binary is built without CDP support, no JS renderers are
+# constructable and the ladder collapses to HTTP-only — the deadline
+# auto-extension policy (`AppConfig::effective_deadline_ms`) gates on this so
+# CDP-less builds keep their strict `deadline_ms_default`. The workspace
+# binary enables this transitively via `crw-renderer/cdp`.
+cdp = []
+
 [dependencies]
 crw-mcp-proto = { path = "../crw-mcp-proto", version = "0.6.1" }
 serde = { workspace = true }