Both prepare-time probing and launch-time race-retry generated the
same `<base>, <base>-2, ..., <base>-N` sequence with their own copies
of the suffix arithmetic and the 99-cap. Extract the candidate stream
into docker/util.container_name_candidates and have both call sites
walk it; each keeps its own predicate (probe vs. retry).
Also bumps the cap into a named constant (MAX_CONTAINER_SUFFIX) so
the two error messages can't drift.
New file claude_bottle/backend/util.py for cross-backend host-side
helpers:
host_skill_dir(name) — resolves $HOME/.claude/skills/<name>
docker/util.py gains:
docker_exec_root(container, argv) — `docker exec -u 0` wrapper used
by SSH provisioning
DockerBottleBackend drops the two methods that wrapped these
(`_host_skill_dir`, `_docker_exec_root`) — they had no instance state
and just lived on the class for organizational reasons. Call sites
now use the imported functions directly.
Across the package:
- claude_bottle/platform/ -> claude_bottle/backend/
- platform/docker/platform.py -> backend/docker/backend.py
- class BottlePlatform -> BottleBackend
- class DockerBottlePlatform -> DockerBottleBackend
- get_bottle_platform() -> get_bottle_backend()
- env var CLAUDE_BOTTLE_PLATFORM -> CLAUDE_BOTTLE_BACKEND
- dict _PLATFORMS -> _BACKENDS
"Backend" is shorter and more established as the term for a
pluggable strategy-pattern implementation. "Platform" was vague
(could mean OS, hardware, cloud) and mildly redundant — Docker is
itself a platform.
The previous PRD section claiming "the Backend protocol was
rejected" referred to a low-level run/exec/cp/network_connect
protocol; the name was never the reason. The PRD is updated to
describe that rejected design by shape rather than by name.
The bottle/agent concepts and the manifest schema are unchanged.
didericis