[codex] Route hook branch tracking by session worktree cwd

[ScriptedAlchemy]

Summary

• Route hook shell branch plans through the hook event cwd's linked worktree when it belongs to the same git common dir as the served project.
• Use the session worktree's current branch for ambiguous git state changes such as git pull --rebase.
• Add regression coverage for branch switches and ambiguous git changes from linked session worktrees.

Validation

• CARGO_TARGET_DIR=/tmp/tracedecay-hook-routing-target cargo build
• CARGO_TARGET_DIR=/tmp/tracedecay-hook-routing-target cargo test -q mcp::hook_events::tests::
• CARGO_TARGET_DIR=/tmp/tracedecay-hook-routing-target cargo test -q --test hooks_lsp_suite hook_branch_routing_test
• CARGO_TARGET_DIR=/tmp/tracedecay-hook-routing-target cargo test -q --test hooks_lsp_suite cursor_shell_sync_plan

Note: the default shared target dir had stale/corrupt artifacts, so validation used a fresh target dir.

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Latest commit: adf9222

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[chatgpt-codex-connector]

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