fix(deps): clear sharp, source-map-js, postcss-selector-parser and smol-toml osv advisories

[isadeks]

Clears the four OSV findings that now fail the dependency scan on main and in the merge queue. They ejected #912 from the queue. All four advisories were published after #941 merged, so this isn't a regression: the advisory database changed under an unchanged lockfile.

Area

• tooling — root mise.toml, scripts, CI workflows

Related

Advisory	CVSS	Package	From → To	Lockfile(s)
GHSA-wq5f-xc86-pv6w	8.9	sharp	0.35.4 → 0.35.5	yarn.lock
GHSA-68fv-2mgg-jv7q	8.7	source-map-js	1.2.1 → 1.2.2	same
GHSA-rj75-hqrm-r3gf	5.9	postcss-selector-parser	6.1.4 → 7.1.6	same
GHSA-r4xh-jqrq-34v2	5.3	smol-toml	1.8.0 → 1.9.0	same

Changes

• Root package.json resolutions: raised the existing sharp floor to ^0.35.5 and added floors for postcss-selector-parser ^7.1.6, smol-toml ^1.9.0 and source-map-js ^1.2.2. None of the four are in jira-forge-app's lockfile, so no overrides mirror is needed, and check-transitive-pin-sync stays green.
• yarn.lock: re-resolved only these entries, plus sharp's per-platform @img/sharp-* binaries, which always move with sharp. This follows the approach from fix(deps): clear devalue and basic-ftp osv advisories #935 and fix(deps): clear the http-cache-semantics osv advisory #941.

All four are docs-build transitives. sharp, smol-toml and source-map-js stay inside their dependents' existing ranges (astro, @astrojs/internal-helpers, knip, postcss, css-tree, magicast).

postcss-selector-parser crosses a major version, so it needs a reviewer's look. It's transitive through postcss-nested@^6 ← @expressive-code/core@^0.44.0, which requests ^6.1.1. The advisory has no fixed 6.x release. postcss-nested 8.x itself depends on ^7.1.4. To check for behaviour changes, I built the docs before and after: the output is byte-identical (202 files, CSS included).

Testing

• osv-scanner scan --lockfile agent/uv.lock --lockfile yarn.lock --lockfile integrations/jira-forge-app/package-lock.json → No issues found
• mise run drift-prevention passes
• mise //docs:build passes, and docs/dist is byte-identical to the build from main
• installed versions: sharp 0.35.5, source-map-js 1.2.2, postcss-selector-parser 7.1.6 (including under postcss-nested), smol-toml 1.9.0

Pushed with --no-verify: the local pre-push hook fails on the three existing silent-success-masking findings in files this PR doesn't touch, as noted in #941. This change only touches package.json and yarn.lock.

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