Make the config file the only home for settings

With no production instance yet, there is no reason to carry two ways
of configuring the agent. Every environment variable that duplicated a
config key is gone; the environment now supplies only the secrets the
file references by ${…}, plus NISSE_CONFIG and NISSE_ENV to find the
files.

- AgentConfig loads from a file (load, from_file) or a parsed tree
  (from_tree, for tests); a missing file is an error naming the example
- The from_env constructors on LiteLLMClient, AnthropicPassthroughClient,
  GiteaClient, MatrixConfig and RoleMap are removed, with the env
  reading for max output tokens; clients take their settings from config
- The live integration tests share a committed agent config,
  tests/integration/nisse-test.yaml, aimed at test resources, and one
  conftest that loads it and builds clients. NISSE_LIVE_PLANNER_MODEL
  becomes its planner role; NISSE_CAPABILITY_MODELS stays as a per-run
  switch
- A missing secret now fails the live tests instead of skipping them
- CI passes only the three tokens
- .env.example is secrets only; spec A5 says config comes from the file

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/Architecture-Build-Spec.md

@@ -389,8 +389,10 @@ Requirements:
 - **No vendor credentials on the agent VM.** LiteLLM holds every key, sourced from
   Bitwarden machine accounts (A7); the agent holds one LiteLLM token. Adding a vendor
   does not touch the agent VM, and a compromised agent leaks no provider keys.
-- Config from env/`.env`, **nothing hardcoded**: base URL, auth token, and the role
-  mapping (A11). Changing any of it is an env change + restart, nothing more.
+- Config from the agent's config file, **nothing hardcoded**: base URL, auth token,
+  and the role mapping (A11). Secrets in it are references to environment
+  variables, never values. Changing any of it is a config edit + restart,
+  nothing more.
 - **Budget caps and spend alerts live on the LiteLLM virtual key**, not in agent code.
 
 ### A6. Browser Tool