Addresses a second review pass against 10655792.
1. Scope membership configuration was directly user-mutable.
`PUT /sessions/{id}/peers/{peer_id}/config` had no scope guard at all, and
`crud.set_peer_config` resolved the peer only to discard the row. Confirmed:
posting `{"observe_others": false, "observe_me": true}` for a scope returned
204 and persisted, which silently stops all fan-out into the scope and makes
Honcho form a representation *of* a scope — neither of which is reachable
through the facade. Deterministic, no race required. Now checked on the row
`get_peer` already returns, so it costs nothing and cannot race.
2. Empty and over-long names were still 500s. Removing the charset pattern from
`PeerSpec` fixed one trap but left its length bounds, and request-bound peer
names carry no length limits of their own — so `peer_id: ""` or a 513-char
name reached `PeerSpec(...)` and raised a raw pydantic ValidationError that
the catch-all turned into a 500. `PeerSpec` now carries no constraints at all
(matching its documented purpose) and every rule for a new name lives in
`_validate_new_peer_names` on the insert path.
3. Resolved-row protection generalized. The previous pass applied it only to
membership upserts, leaving check-then-use windows elsewhere: peer update
could have a concurrently-created scope's configuration replaced wholesale
(create-path validation does not fire for a peer that now exists), the chat
observer get-or-create could resolve a fresh scope as its observer, and the
generic session-peer removal could silently detach a scope from its sessions.
Each now inspects the resolved peer immediately before acting; the redundant
name-level guard on the update route is dropped in favor of the race-free one.
`remove_peers_from_session` grows an internal `_allow_scope_peers` flag because
the scopes facade ends membership through that same path and must not be blocked
by its own guard.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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