fix(ci): restore the nub.jsonc schema the build and release tools read

[pullfrog]

Closes #650

Diagnosis

Not #647 — that commit is innocent. The break came from 3539b65db ("site: hide the nub.jsonc config reference until it ships"), which deleted site/public/schema/latest.json and v0.6.json along with the docs page and the /schema route. Those two files are not only published assets — three internal tools read them:

Consumer	Effect of the deletion
crates/nub-cli/src/project_config.rs:1930	include_str!("../../../site/public/schema/latest.json") — the nub bin's test target stops compiling
scripts/set-version.mjs:26	make version V=<v> aborts before stamping any version surface
Makefile:206	make version-check fails with missing or unreadable schema snapshot for v0.6.json

The first one is the trunk-red. Reproduced with the exact CI command on the failing SHA:

error: couldn't read `crates/nub-cli/src/../../../site/public/schema/latest.json`: No such file or directory (os error 2)
    --> crates/nub-cli/src/project_config.rs:1930:34
error: could not compile `nub-cli` (bin "nub" test) due to 1 previous error

That explains the failure shape: Check, Clippy, and all 7 Test legs red on every platform, while Format, Site build, Yarn PnP, and embed-runtime verify stayed green — those build no test target.

It reached main green because the deletion was confined to site/**, which resolves the rust paths-filter group false on a pull_request. On push: main that group is always true, so the first Rust job to run was the one on trunk.

Fix

• Restores both schema files byte-for-byte from 4815226bb, the parent of the deletion. Everything user-visible — the /docs/config page, its nav entry and sidebar chip, the /schema index route — stays removed, so nothing is republished and reverting 3539b65db still restores the whole surface when the feature ships.
• Adds the two site/public paths that are Rust compile inputs (schema/** and skill.md, the latter read by crates/nub-cli/src/agent/mod.rs) to the rust paths-filter group, so the next edit to either runs the Rust jobs on the PR instead of on trunk.

Verification

• cargo check --all-targets --profile fast — the failing CI step, now exit 0.
• cargo test -p nub-cli --bin nub published_schema_exposes_every_parser_key — passes, so the restored schema still matches the parser's ROOT_KEYS / INSTALL_KEYS / DLX_KEYS and enum value sets at this SHA.
• make version-check — passes; confirmed as a negative control that it fails with the files moved aside.

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Project	Deployment	Actions	Updated (UTC)
nub	Ready	Preview	Aug 1, 2026 3:53am