#232 fix: treat current search root as local

Summary

• short-circuit canonical current-root aliases before external Git-root probing
• return the configured root's original path form after the normalized comparison
• cover non-Git absolute-root, dot-root, distinct non-Git, and restricted-root behavior

Closes #227

Verification

• red phase on the parent commit: the restricted same-root case failed with not_a_git_root
• focused restriction regression: 1 passed
• full aft_search_contract_test module: 42 passed
• cargo +1.93.0 check -p agent-file-tools --tests
• cargo +1.93.0 fmt --all -- --check
• live NDJSON tool_call probe with restrict_to_project_root: true: path: "." found the non-Git workspace symbol, while a distinct Git root returned path_outside_root

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Summary by cubic

Treats search requests that alias the configured project root (including "." and symlinks) as local, skipping external Git-root probing. Previously these aliases could be treated as external, returning not_a_git_root or path_outside_root in non-Git workspaces or with restrict_to_project_root enabled.

• Normalize the requested path and the configured root once before comparison; when equal, return the configured root’s original path form.
• Normalize upfront so Git probing uses a non-verbatim path on Windows; remove the now-redundant later normalization.
• Tests: non-Git same-root and "." return byte-identical responses to default search; with restrict_to_project_root=true, same-root is allowed and external roots are rejected; external non-Git roots still return not_a_git_root.

Greptile Summary

This PR treats canonical aliases of the configured search root as local, avoiding unnecessary Git-root probing while preserving the configured root’s original path form.

• Normalizes the requested path before comparing it with the configured project root.
• Returns the configured root directly when both paths identify the same location.
• Adds coverage for non-Git roots, dot aliases, root restrictions, and distinct external paths.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
crates/aft/src/readonly_artifacts.rs	Normalizes the nearest existing requested path and short-circuits when it identifies the configured project root.
crates/aft/tests/integration/aft_search_contract_test.rs	Adds regression coverage for same-root aliases in non-Git and root-restricted search configurations.

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