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Enroll lib-test and demos in the watcher

The gap

Track B's entire gate — make lib-test (48 compile+output-assert steps: RTL smoke, PAL cross under qemu, ESP object emission) and make demos (19 example compile-smokes) — runs only when a B agent types it. The watcher covers core/threads/asm/C-conformance/cross/sqlite/lua but not one library job beyond the lib-fpc-clean grep. Concrete cost today: the esptimer lib-test step has been red for an unknown number of commits (pinned binary predates the b360 emit-obj fix) and nothing recorded the first bad SHA.

Pin-lag caveat (design point, not a footnote)

lib-test/demos build with $(PXX_STABLE) (the PINNED binary), not HEAD. So a red has TWO causes: (a) a lib/examples change broke it — a normal regression; (b) the pin is stale relative to lib/ expectations — a Track A "re-pin needed" signal, exactly the esptimer case. The report format should make the compiler identity visible (pin version/sha256 from stable_linux_amd64/default/pin.log) so a triaging agent can tell (a) from (b) without re-deriving it.

Scope

Done when

A commit that breaks a library smoke or a demo compile shows up as a tstate NEW-RED with the pin identity attached; the esptimer-style silent red cannot recur.