Channing Conger
9c79d87d06
code-mode: make session shutdown authoritative ( #29287 )
...
## Summary
- Give each session and cell a hierarchical cancellation token.
- Track cell tasks so shutdown waits for admitted actors without polling
the registry.
- Make shutdown authoritative across concurrent admission and
non-cooperative callbacks.
## Why
A best-effort registry scan can miss cells admitted concurrently or
blocked behind the registry lock.
## Impact
Session shutdown reliably stops every admitted cell and rejects new work
once shutdown begins.
## Validation
- Stack-tip validation: `just test -p codex-code-mode -p
codex-code-mode-protocol` (70 passed).
- Parent branch: `cconger/code-mode-runtime-compact-03c-terminal-state`.
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