feat: DISABLE_SKILLS experiment toggle + tool arg schema improvements

[isiddharthsingh]

Summary

• Adds DISABLE_SKILLS env-var toggle that bypasses integration skill markdown and unregisters the load_skill LLM tool, so the agent can be A/B tested relying purely on tool descriptions.
• Adds Pydantic args schemas (CloudExecArgs, IacToolArgs, TerminalExecArgs, AnalyzeZipArgs, OnPremKubectlArgs) so the LLM sees enum hints and per-field descriptions in the tool JSON schema. Adds a list_onprem_clusters discovery tool so the agent can find cluster IDs without skill guidance.
• Gate is scoped narrowly: only the interactive_load_skill segment + SkillRegistry integration methods short-circuit when the flag is on; identity, security, behavioral_rules, RCA scaffolding, and core prompts keep loading.
• Env var wired through docker-compose.yaml, docker-compose.prod-local.yml, docker-compose.airtight.yml, deploy/helm/aurora/values.yaml, and .env.example.

Test plan

• 33/33 pytest cases pass (tests/experiment/test_disable_skills.py)
• Live RCA run with flag on completed end-to-end; system prompt verified to retain identity/security/RCA scaffolding while integration-index and load_skill directive are absent
• list_onprem_clusters returns the status:ok|error envelope; verified the error path for unresolvable users
• Cache key invalidates on flag toggle; verified load_skill tool is unregistered when the flag is on

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• Create PR with unit tests
• Commit unit tests in branch sms10221/dev-disable-skills-toggle

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud