Merge branch 'claude/forward-project-args': sibling projects inherit the args, lint with the lite rules

PR #40. GitProject and LocalProject default their args to the loading
project's own (ProjectArgs()), this tree lints with LintRules' lite
set, and the fixes from the branch's review: a project file gets its
args only for the CrafterBuildProject call, host tooling gets project
cache entries of its own, and `--` ends crafter-build's options.

The conflicts with claude/dependency-notes are all places both sides
added to:
- Platform.cppm and Platform.cpp: PragmaDependencies() beside
  ProjectArgs() and LoadingHostTooling(), all three kept.
- LoadProject: the record PragmaDependencies() reads moves up with the
  frame's dependencies, which this branch sets before dlopen. Left
  where it was, it would have copied preDeps.configs after the vector
  was moved into the frame, and recorded nothing.
- README: the pragma section's new last sentence goes before the new
  "Dependency notes for agents" section.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

interfaces/Crafter.Build-Clang.cppm

@@ -484,7 +484,9 @@ export namespace Crafter {
         // cfg.files, say), and without it both flag settings share one bin dir
         // and interleave their outputs there. Populated by ApplyStandardArgs;
         // the args it does recognise are excluded, since their effect already
-        // shows up in target/march/mtune/debug/sysroot/type.
+        // shows up in target/march/mtune/debug/sysroot/type. For the same
+        // reason this is not what to hand a sibling project: ProjectArgs() is
+        // every arg, the recognised ones included.
         std::vector<std::string> projectArgs;
         std::vector<Test> tests;
         // Lint rules for `crafter-build lint`. Populate via AddLintRule.