Remove provider-specific branching from egress.py and pipelock.py.
Previously, `egress_routes_for_bottle` and `pipelock_effective_tls_passthrough`
both contained `template == "codex"` checks — the same pattern the rest
of the PR moved out of the backends.
Root cause: `EgressRoute` had no `tls_passthrough` field, so pipelock
couldn't learn from the synthesised Codex routes that they needed
passthrough. Fix:
- Add `EgressRoute.tls_passthrough: bool`. `egress_manifest_routes` lifts
the existing `pipelock.tls_passthrough` manifest flag here; provider
routes set it directly.
- Add `AgentProvisionPlan.egress_routes`. `agent_provision_plan` populates
it for Codex + `forward_host_credentials`, including `tls_passthrough=True`.
- Replace Codex-specific `egress_routes_for_bottle` logic with a generic
`_merge_provider_route` helper. Backends call `egress_routes_for_bottle(bottle,
plan.egress_routes)`; no provider type checks inside egress or pipelock.
- Rewrite `pipelock_effective_tls_passthrough` to read `route.tls_passthrough`
from the merged route set instead of re-implementing the provider check.
- Both backends now call `agent_provision_plan` before `Egress.prepare` and
`PipelockProxy.prepare`, threading `plan.egress_routes` to both. `has_provider_auth`
is derived from `egress_manifest_routes` (manifest routes only — provider
routes carry no auth roles, so the result is identical).
Assisted-by: Claude Code
didericis-claude
didericis-codex