Testing: north-star2-verify optional 007 ThrowsWeb ladder (init + VM smoke)

[PurHur]

Problem

script/north-star2-verify.sh (#1865 ✅) covers M0–M4 self-host probes but no step for the shipped 007-ThrowsWeb integration ladder:

• phpc init --profile throwsweb (DevEx: phpc init --profile throwsweb (007-ThrowsWeb scaffold parity) #2092 ✅)
• make examples-throws-smoke (Testing: make examples-throws-smoke target (007-ThrowsWeb) #2141 ✅)
• THROWS_WEB_SMOKE_GATE default-on (CI: Default THROWS_WEB_SMOKE_GATE=1 in ci-fast after #2093 green #2125 ✅)

Presenters running make north-star2-verify must remember separate example commands from docs/GETTING-STARTED.md §5b (#2158).

Goal

Extend north-star2-verify.sh with an optional tail step (default on when example tree exists; skip when loopback bind fails — same pattern as web smokes):

1. php script/check-init-throwsweb-parity.sh (fast; CI: INIT_THROWSWEB_PARITY_GATE default-on in ci-fast after #2086 checker #2127 default-on)
2. make examples-throws-smoke or THROWS_WEB_SMOKE_GATE=1 ./script/examples-web-smoke.sh --throws-only
3. Print next hints for AOT (Language: AOT throw/catch with user-defined class (007 ValidationError execute) #2157, Testing: THROWSWEB_AOT_LINK_GATE + THROWSWEB_AOT_SMOKE_GATE (007-ThrowsWeb) #2101) when LLVM ready

Add NORTH_STAR2_THROWSWEB_GATE="${...:-1}" to script/ci-defaults.env with opt-out =0 for harness hosts without TCP loopback.

Implementation hints

File	Notes
script/north-star2-verify.sh	New step 6 or --skip-throwsweb flag
Makefile north-star2-verify	Pass through env
lib/Doctor.php	List gate under NS2 section (#2053 pattern)
test/unit/NorthStar2VerifyTest.php	Assert script mentions examples-throws-smoke

Acceptance criteria

make north-star2-verify
# includes throwsweb step; exit 0 when #2076 green

NORTH_STAR2_THROWSWEB_GATE=0 make north-star2-verify
# skips throwsweb step

Harness:

./script/docker-exec.sh -- bash -lc 'make north-star2-verify'

Do not require GitHub Actions (#394 ✅).

Dependencies

• Examples: 007-ThrowsWeb — throw/catch presenter app (post-#195/#57) #2076 ✅ — example tree
• DevEx: phpc init --profile throwsweb (007-ThrowsWeb scaffold parity) #2092 ✅ / CI: INIT_THROWSWEB_PARITY_GATE default-on in ci-fast after #2086 checker #2127 ✅ — init parity
• CI: Default THROWS_WEB_SMOKE_GATE=1 in ci-fast after #2093 green #2125 ✅ — VM smoke default-on
• AOT steps remain Language: AOT throw/catch with user-defined class (007 ValidationError execute) #2157 / Testing: THROWSWEB_AOT_LINK_GATE + THROWSWEB_AOT_SMOKE_GATE (007-ThrowsWeb) #2101 (out of scope)

Links

• DevEx: make north-star2-verify presenter gate (self-host M0–M4) #1865 · Docs: GETTING-STARTED optional 007-ThrowsWeb presenter step (curl invalid POST) #2158 · ROADMAP 🗺️ ROADMAP: Self-host + web-capable PHP subset (living) #78 Phase 4 Polish