Add a new CLI option -s, --strategy <type> to the devrank:spider command to force the execution of a specific discovery strategy.

Requirements:

• Update apps/devrank/services/Manager.mjs to parse the new option.
• Update apps/devrank/services/Spider.mjs to accept a strategy override in its run() method.
• Supported values: community (alias for community_scan), keyword, temporal, stargazer, search (Core).

Acceptance Criteria:

• npm run devrank:spider -- --strategy community executes only the Community Scan.
• Run the spider 2 times with the new strategy to seed diversity data.