Rust CLI Cutover (Burndown List)

Rust CLI Cutover

As we announced recently, Codex CLI is Going Native, which means we will ultimately be retiring the TypeScript version of the CLI in favor of the Rust one. This issue is used to track the outstanding work we need to do before we are comfortable making the Rust CLI the default (P0, P1), as well as some "nice-to-haves" (P2). The critieria for task priority is as follows:

• P0 Must fix: prevents users from using the Rust CLI.
• P1 Features that exist in the TypeScript CLI that don't _prevent_ users from using the Rust CLI, but users clearly miss them.
• P2 Valuable "quality of life" features that exist in the CLI today (or do not exist, but are highly requested) that should be "fast follows" after the P1s are complete.

P0

• [x] #1243

P1

• [x] #1242
• [x] #1244
• [x] #1245
• [x] #1246
• [x] #1247
• [x] #1248
• [x] #1249
• [x] #1250
• [x] #1251
• [x] #1252
• [x] #1253
• [x] #1254

P2

• [x] #1255
• [x] #1256
• [x] #1257
• [x] #1258
• [x] #1259
• [x] #1260
• [x] #1261