docs: gateway inheritance makes team_template optional + one-pick archetype note (#14)

With portfolio v0.14 a spawned team inherits the PM's own resolved gateway (+ its
OPENAI_API_KEY via the team's env), so team_template is now OPTIONAL — empty is the happy
path and a team runs real turns with zero creds prep. Reframe the bundle config comment +
README Install block accordingly (team_template = a per-team-gateway escape hatch, not a
prerequisite), and note the one-pick 'Portfolio Manager' archetype setup.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: mabry1985

README.md

@@ -41,14 +41,20 @@ apply them to your `config/langgraph-config.yaml`:
 ```yaml
 plugins:
   enabled: [delegates, portfolio]
-portfolio:
-  # The base team config portfolio_spinup_team clones per project. Empty uses the portfolio
-  # plugin's shipped example; point it at a creds-filled copy (gateway key + model.api_base)
-  # so spawned teams run real model turns.
-  team_template: /path/to/your/team-template
+# That's it — no team_template needed. Spawned teams INHERIT the PM's own gateway
+# (portfolio v0.14+): the PM's resolved model.api_base + its OPENAI_API_KEY (via the team's
+# environment) carry over, so a team boots ready to think with zero creds prep. Only set a
+# team_template for a team you want on a DIFFERENT gateway than the PM's:
+# portfolio:
+#   team_template: /path/to/your/team-template   # optional — a per-team gateway/config
 ```
 then restart. The board the PM's teams run needs the `br` (beads) CLI on this host.
 
+**One-pick setup:** installing the bundle also registers a **"Portfolio Manager"** archetype
+in the new-agent picker (ADR 0042) — pick it and you get a PM with `delegates`+`portfolio`
+enabled and the manager persona set, no YAML. With gateway inheritance there's nothing else
+to configure: spin up a team and it runs on your gateway.
+
 ## Spinning up teams
 Once enabled, the Portfolio Manager spins up an ephemeral Lead Engineer team per project:
 ```

protoagent.bundle.yaml

@@ -48,10 +48,11 @@ plugins:
 enabled: [delegates, portfolio]
 config:
   portfolio:
-    # The base team config portfolio_spinup_team clones per project. Empty falls back to
-    # the portfolio plugin's shipped example (a generic project_board + delegates team);
-    # point this at a creds-filled copy (gateway key + model.api_base) so spawned teams
-    # run real model turns. {{REPO}} / {{TEAM_NAME}} / {{GATE}} are filled per spawn.
+    # The base team config portfolio_spinup_team clones per project. EMPTY IS THE HAPPY PATH
+    # (portfolio v0.14+): a spawned team inherits the PM's own resolved gateway + its
+    # OPENAI_API_KEY (via the team's env), so it runs real model turns with NO creds prep.
+    # Only point this at a creds-filled copy for a team on a DIFFERENT gateway than the PM's.
+    # {{REPO}} / {{TEAM_NAME}} / {{GATE}} are filled per spawn.
     team_template: ""
 
 # Agent archetype (ADR 0042) — presents this bundle as a "Portfolio Manager" agent type