fix(secrets): redact key names and resolution paths from debug logs (issue #16)

[xdevrobot]

Summary

Fixes CWE-532 (Insertion of Sensitive Information into Log File) — secret key names, env var names, and resolution paths were logged at debug level in secrets.ts and plugin-loader.ts. When /verbose is enabled, these logs expose the secret topology to all log consumers.

Changes

src/sdk/secrets.ts

• Debug logs no longer include key names or env var names
  • Before: Secret "API_KEY" resolved from env var MYPLUGIN_API_KEY
  • After: Secret resolved for myplugin
• require() error message no longer includes the key name
  • Before: Missing required secret "MISSING_KEY"
  • After: Missing required secret for plugin "myplugin"

src/agent/tools/plugin-loader.ts

• Missing-secrets warning now shows a count instead of listing key names
  • Plugin "myplugin" has 2 missing required secret(s). Set via: /plugin set myplugin
• Individual key names logged only at debug level (requires /verbose)
• Detail hint added when not in verbose mode: (enable /verbose for details)

src/sdk/tests/secrets.test.ts

• Updated assertions to verify key names and env var names are NOT present in debug logs
• Updated require() error message assertions to check key name is excluded

Security Impact

• Prevents secret topology leakage via debug logs (log aggregation, Telegram group chats)
• Key names no longer appear in error messages thrown by require()
• Missing-secrets warnings no longer enumerate secret names at warn level

Closes #16

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