Add approval allow-prefix flow in core and tui

Add explicit prefix-approval decision and wire it through execpolicy/UI snapshots

update doc

mutating in memory policy instead of reloading

using RW locks

clippy

refactor: adding allow_prefix into ApprovedAllowPrefix

fmt

do not send allow_prefix if execpolicy is disabled

moving args around

cleanup exec_policy getters

undo diff

fixing rw lock bug causing tui to hang

updating phrasing

integration test

.

fix compile

fix flaky test

fix compile error

running test with single thread

fixup allow_prefix_if_applicable

fix formatting

fix approvals test

only cloning when needed

docs

add docstring

fix rebase bug

fixing rebase issues

Revert "fixing rebase issues"

This reverts commit 79ce7e1f2fc0378c2c0b362408e2e544566540fd.

fix rebase errors

docs/config.md

@@ -603,7 +603,7 @@ metadata above):
 - `codex.tool_decision`
   - `tool_name`
   - `call_id`
-  - `decision` (`approved`, `approved_for_session`, `denied`, or `abort`)
+  - `decision` (`approved`, `approved_allow_prefix`, `approved_for_session`, `denied`, or `abort`)
   - `source` (`config` or `user`)
 - `codex.tool_result`
   - `tool_name`