fix(runtime): resolve physical roots before logical /data aliases

[GTC2333]

Problem

When BP_DATA_DIR=/data, the agent workspace and persistent library use physical paths under the same prefix that is also treated as a logical alias:

• workspace: /data/workspaces/<session>
• persistent library: /data/data
• logical /data/...: persistent library

Structured file tools currently interpret every /data/... as a logical path before checking whether it is already a real path under the current workspace or persistent directory. This rewrites workspace paths to /data/data/workspaces/... and can rewrite /data/data/... to /data/data/data/.... Bash still uses the physical path, so Bash and read/write/edit disagree about the same string.

Root cause

rewriteLogicalPath selects /data by string prefix before classifying known physical roots. Existing tests use /root/.bp-root, so they do not cover the production collision.

Proposed fix

• For absolute paths, classify current workspace, attachments, persistent, and shared physical roots first.
• Apply logical aliases only when the path is not already under a known physical root.
• Keep HTTP Files API logical-path behavior unchanged.
• Add regression tests with cwd=/data/workspaces/s1 and persistentDir=/data/data.

Acceptance criteria

• Structured tools and Bash address the same workspace file.
• Real persistent paths are not rewritten twice.
• Logical /data/x still maps to /data/data/x.
• /workspace/x remains session-scoped.
• Existing traversal and cross-session confinement tests continue to pass.

[GTC2333]

Local fix implemented and verified:

• rewriteLogicalPath now classifies absolute paths under known physical roots before applying logical aliases.
• Added the production collision regression case with cwd=/data/workspaces/s1 and persistentDir=/data/data.
• Verified physical workspace paths, physical persistent paths, and logical /data/... paths resolve independently.

Validation: runtime typecheck passes; full runtime suite passes (579 tests). Changes are currently in the working tree and not yet committed/PRd.