fix(runtime): honour HERMES_LLM_BASE_URL in pool-based and explicit runtime resolution

[OmarB97]

What does this PR do?

Two runtime-resolution paths ignore the HERMES_LLM_BASE_URL environment variable. When an operator points Hermes at a local proxy via that variable (e.g. a loopback proxy that captures/streams inference traffic), inference silently bypasses the proxy and goes straight to the provider's default upstream:

• _resolve_runtime_from_pool_entry() — the pool-based path used for mid-session /model switches — never consulted HERMES_LLM_BASE_URL.
• _resolve_explicit_runtime() — honoured a provider's own base_url_env_var but dropped HERMES_LLM_BASE_URL when a provider defined no such variable.

Other resolution paths already honour HERMES_LLM_BASE_URL; this brings the two remaining paths in line so the override is respected consistently. An explicit base_url (from config or the pool entry) still takes precedence.

Related Issue

N/A. Extracted as a focused, single-file change from #34023 at a reviewer's request — that PR shared a stacked branch and showed unrelated changes against main.

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)

Changes Made

• hermes_cli/runtime_provider.py
  • _resolve_runtime_from_pool_entry(): when HERMES_LLM_BASE_URL is set, use it as base_url.
  • _resolve_explicit_runtime(): fall back to HERMES_LLM_BASE_URL when the provider defines no base_url_env_var.

(+15 lines, 1 file.)

How to Test

# 1) Unset -> provider default
env -u HERMES_LLM_BASE_URL python -c "from hermes_cli.runtime_provider import resolve_runtime_provider as R; print(R(requested='opencode-zen')['base_url'])"
# -> https://opencode.ai/zen/v1

# 2) Set -> override honoured
HERMES_LLM_BASE_URL=http://127.0.0.1:55176 python -c "from hermes_cli.runtime_provider import resolve_runtime_provider as R; print(R(requested='opencode-zen')['base_url'])"
# -> http://127.0.0.1:55176

Both verified locally on this branch. An explicit per-model / pool-entry base_url still wins over the env var.

Checklist

Code

• My commit messages follow Conventional Commits
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix (1 file, +15 lines)
• I've run pytest tests/ -q and all tests pass
• I've added tests for my changes

[OmarB97]

Closing this older HERMES_LLM_BASE_URL runtime-provider PR in favor of the now-narrowed canonical PR #34332. #34332 is rebased to current main, one commit/two files, has the focused regression tests, and keeps the profile-override work separate in #35076.