Report rejected Requests to YasConnection failure listeners

[jsegaran]

Adds YasConnection.onRequestFailure(listener), so an embedder can observe every Request whose promise rejects in one place, without wrapping each family client call site.

The listener receives { family, kind, error } and runs synchronously, before the rejection reaches the caller. It fires for:

• a non-OK Result (YasResultError)
• a Result body that fails to decode
• a Request the server does not advertise
• a frame that could not be written
• a session lost with the Request still in flight

Non-OK statuses returned through requestResult resolve as envelopes and are not reported.

The hook goes on the pending request's reject rather than on a .catch around the returned promise, so resolution timing does not change. Listener exceptions go through the existing reportListenerError.

Indent's web client will use this to send YAS errors caused by our own code to Sentry. Consuming it in neo needs an @yas-run/core release that includes this change.

Tests: vitest run src/__tests__/yas.test.ts passes, including the new case. The new case fails without the change. tsc --noEmit is clean.

Tag @indent to continue the conversation here.

[github-actions]

Coverage

Crate	Lines	Functions	Regions
alacritty-driver	85.6% (1081/1263)	89.4% (84/94)	89.3% (1746/1955)
browser	25.5% (309/1212)	30.4% (34/112)	27.7% (605/2183)
cli	32.4% (6661/20544)	33.6% (615/1831)	33.4% (9789/29330)
client	66.9% (4968/7425)	68.1% (627/921)	65.1% (6423/9873)
composite-transport	96.3% (526/546)	98.4% (60/61)	96.2% (884/919)
compositor	54.9% (11396/20763)	65.9% (831/1261)	54.7% (15780/28844)
desktop	78.4% (4460/5691)	71.6% (393/549)	75.1% (6211/8267)
edge	63.1% (800/1268)	50.9% (82/161)	58.0% (1043/1799)
fonts	77.3% (1257/1626)	82.7% (129/156)	78.9% (2424/3071)
fssync	86.0% (1609/1872)	85.8% (182/212)	87.0% (2833/3255)
git	70.4% (4462/6334)	68.5% (337/492)	67.2% (6311/9386)
guest	67.3% (6829/10148)	67.0% (488/728)	66.6% (8935/13416)
lsp	78.7% (3573/4542)	80.8% (336/416)	76.7% (5408/7054)
proxy	63.3% (1899/3000)	56.6% (184/325)	63.5% (2929/4613)
runtime-dir	93.6% (117/125)	100.0% (14/14)	94.8% (218/230)
sd-notify	69.6% (64/92)	100.0% (6/6)	80.9% (106/131)
server	70.8% (84418/119305)	73.3% (6132/8366)	68.8% (113101/164459)
ssh	67.2% (708/1054)	75.9% (85/112)	67.2% (1105/1645)
terminal-model	49.9% (314/629)	62.3% (38/61)	50.3% (505/1004)
uplink	94.2% (582/618)	92.6% (50/54)	93.1% (1062/1141)
webrtc-forwarder	33.6% (1321/3932)	44.9% (146/325)	36.0% (2279/6336)
webserver	80.7% (1490/1846)	81.1% (193/238)	83.2% (2551/3067)
website	35.1% (355/1012)	34.4% (53/154)	35.8% (607/1694)
xtask	0.0% (0/5149)	0.0% (0/131)	0.0% (0/9157)
yas	88.9% (28010/31522)	93.9% (2146/2286)	84.0% (43994/52388)
Total	66.5% (167209/251518)	69.5% (13245/19066)	64.9% (236849/365217)