security: bound and validate discovered project configuration - #419
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The convenience profile now bounds ancestor discovery, stops at project/filesystem boundaries, and validates discovered configuration permissions and path components before loading. Project environment files receive the same gate. An explicit opt-out supports knowingly shared workspaces; the Windows ACL limitation is documented.
YAML input is capped at 1 MiB and its composed graph is bounded before constructors expand merge aliases. Generic-profile behavior and merge precedence remain unchanged.
Fixes #385.
Branch maintenance
Refs #426. Targets the branch for #418. Retarget and refresh after that parent is squash-merged; preserve the ordered stack.
The branch was refreshed without rewriting history to include
mainata576cc279739eae5e4cfc33ffab2a7fb56de24de.Current-head validation
At
9012457f37a30f73ef54074cc65a3d85298f2580: uv lock freshness and baseline, runtime, strict typing, style, and contracts passed locally with all declared extras. Runtime result: 626 passed, 1 warning, 262 subtests passed in 9.20s.Hosted checks: 7/7 required checks passed; 0 checks pending; 0 unsuccessful checks at 2026-10-04T14:19:40.760978+00:00. See the PR Checks tab and #426 for subsequent results.