feat: unify --local mode to run user agents alongside Hello World (#10)

[alain-sv]

• feat(server): add local-mode handling and hello-world injectionAdd for unified "--local" behavior in Server and tooling.

• import Path in src/supervaizer/server.py support filesystem checks- detect SUPERVA_LOCAL_MODE in Server.init and:
• force supervisor_account=None in local mode (log if overridden)
• api_key to "local-dev" when not explicitly set or via env - enable admin_interface and a2a_end automatically - prepend Hello World agent (via get_default_local_agent) unless SUPERVAIZER_DISABLE_HELLO_WORLD=true or an agent with the slug exists - ensure injection happens before route setup UI and endpoints include the injected agentAdd gh-release target to justfile for creating GitHub releases- new gh-release recipe reads, creates a v release, notes commits since previous tag, publishes to the supervaize/supervaizer repoAdd design doc describing local mode unification- docs/superpowers/specs/2026-03-16-manage-hello-world-design:
• explains goals, design decisions, CLI/server/local_server changes, and cases for combining user agents with the World agentMotivation:
• Unify local and normal runtime paths so users see their agents in --local mode preserving an easy Hello World fallback and avoiding Studio registration/credentials in local dev. The-release target automates creating GitHub releases from the repo version.

• feat: unify --local mode to run user agents alongside Hello World

• Server.init detects SUPERVAIZER_LOCAL_MODE env var:
  • Forces supervisor_account=None (skips Studio registration)
  • Injects Hello World agent unless SUPERVAIZER_DISABLE_HELLO_WORLD=true
  • Defaults api_key to 'local-dev'
  • Deploys agent routes in local mode
• CLI --local sets env var and falls through to normal subprocess path
• Falls back to local_server.py when no supervaizer_control.py exists
• Simplified local_server.py: removed create_local_server(), added main
• Added 8 server tests + 2 CLI tests for local mode behavior

• ✨feat(server): default api_key to local-dev in local modeUpdate tests and docs to reflect that when SUPERVAIZER_LOCAL_MODE truethe server defaults its api_key to "local" even if SUPERVAIZER_API_KEYis. Adjust test wording and expectations to reference theSUPERVAIZER_API_KEY env var rather than a "explicit api_key".

Expand and reformat design docs and implementation for managing theHello World agent local mode: CLI paths, set SUPAIZER_LOCAL_MODE --local, force supervisor_account=None in local mode, inject HelloWorld unless disabled, and enable admin/a2a endpoints Clar edge-casematrix and add a full implementation plan document.

Why- Make local mode behavior explicit and consistent across, tests and docs.

• Provide a clear plan and spec for injecting and managing the Hello agent and related changes.

• fix: add missing field declarations to CaseNode model

CaseNode was missing Pydantic field definitions for name, type, factory, description, and can_be_confirmed. This caused AttributeError on all 9 test_case.py tests.

• ✨ feat(readme): add "local mode" docs and env varsIntroduce a Local Mode section and related CLI/help updates to letdevelopers run the server entirely offline local testing anddevelopment.

• "6. Local mode" ( shift Optional parameters to7) to README, documenting supervaizer start --local, behavior supervaizer_control.py is absent, and how the built-in World agent is managed.
• Document automatic environment changes for local mode: SUPERVAIZER_LOCAL_MODE=true - default API key set to local-dev (overridable via SUPERVAIZER_API_KEY)
• option to disable Hello World viaERVAIZER_DISABLE_HELO_WORLD- Update CLI examples docs/CLI to --local usage and corresponding env var notes.
• AddERVAIZER_MODE and SUPERVA_DISABLELLO_WORLD the env var in to make configurationable.

This makes local development simpler and reduces friction for testingagents without relying on Studio/ registration.

• ✨ feat: improve human_answer handling and server info storage- Refactor work human_answer invocation to more robustly check for agent.methods and the presence of human_answer definition before attempting to execute it. avoids AttributeError and clar conditional logic while the existing behavior of running human_answer method in an executor and handling exceptions logged and error.

• Update server info creation to use a fixed singleton id ("server_instance") when saving to storage subsequent retrievals can reliably the stored ServerInfo entry.

• Add Unit Tests Results section to CHANGELOG with test counts and time.