protocol: align common status handling

[pcarrier]

Summary

Move the existing FS/Git/KV/LSP/NET implementations and client diagnostics onto the common status registry proposed by #167.

• classify malformed Git and LSP inputs as INVALID instead of OTHER
• make Rust and TypeScript status renderers distinguish declared backend OTHER from unknown numeric status values
• update existing-family documentation and comments to point at the canonical registry
• add Rust and TypeScript regression tests

This deliberately excludes the native process RFC, extension runtime work, Git fetch NUL hardening, and Git diff fixture stabilization.

Stack

This is based on #167 because that PR introduces docs/protocol.md#common-status-registry. The code cleanup can be reviewed separately and merged after the base lands.

Verification

• cargo fmt --check
• changed Git status cases: open_reports_repo, tree_blob_and_base, and log_follow_directory_and_unknown_flags
• LSP malformed-path regression
• four remote status-text regressions
• TypeScript status-text test
• tsc --noEmit
• git diff --check

[github-actions]

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Coverage

Crate	Lines	Functions	Regions
alacritty-driver	69.7% (698/1002)	72.0% (54/75)	71.7% (1050/1464)
browser	0.0% (0/807)	0.0% (0/65)	0.0% (0/1370)
cli	17.2% (1521/8826)	28.1% (200/713)	20.1% (2730/13561)
compositor	9.8% (952/9699)	16.2% (73/450)	9.5% (1225/12962)
fonts	81.4% (721/886)	88.6% (70/79)	83.0% (1427/1719)
fssync	92.5% (4880/5274)	94.1% (445/473)	92.5% (8926/9647)
gateway	25.8% (375/1455)	29.9% (38/127)	19.4% (470/2417)
git	87.6% (4199/4793)	88.8% (333/375)	87.3% (6646/7614)
lsp	76.0% (2503/3295)	78.2% (248/317)	73.8% (3886/5266)
proxy	19.3% (172/892)	20.5% (26/127)	21.2% (293/1381)
remote	90.3% (8650/9575)	93.6% (624/667)	88.1% (14365/16306)
sd-notify	73.9% (68/92)	100.0% (6/6)	83.2% (109/131)
server	38.6% (7046/18262)	52.8% (676/1281)	41.1% (11938/29049)
ssh	1.9% (7/374)	3.2% (1/31)	0.7% (4/613)
upsidedown	31.4% (391/1247)	27.8% (55/198)	34.8% (797/2287)
webrtc-forwarder	2.7% (72/2624)	2.1% (4/187)	1.2% (50/4335)
webserver	60.3% (1051/1742)	64.7% (156/241)	63.1% (1800/2851)
Total	47.0% (33306/70845)	55.6% (3009/5412)	49.3% (55716/112973)

[indent]

Issues

Review closed.

CI Checks

1 CI check failed on 0e54c35.

lint

• lint finished with failure.