feat(registry): improve search and setup flows

[Haz3-jolt]

Purpose / Description

Improve Observal registry discovery and setup flows so users can ask for agents or skills with natural keywords, pull agents with non-interactive setup values, and submit component definitions without being forced into prompts.

Fixes

No linked issue.

Approach

• Added shared keyword tokenization and ranking for registry list endpoints.
• Applied ranked search to agents, MCPs, skills, hooks, prompts, and sandboxes.
• Extended MCP git analysis to infer local OCI container setup from Dockerfile, Containerfile, and compose build services.
• Added flag-only submit paths for skills, hooks, prompts, and sandboxes.
• Added flag-only agent init scaffolding.
• Updated bundled Observal skills to route natural search requests and prefer flag-first setup flows.

How Has This Been Tested?

Learning (optional, can help others)

Reused the existing MCP repository analyzer instead of adding a new parser or service. The existing clone and analysis path already handled most git based MCP submissions, so this change only adds the missing local container heuristics.

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)

AI Assistance

Generative AI tooling was used to co-author this PR.

• Yes(Please Specify the tool): Pi coding agent
• Was the generated code manually reviewed and tested?

[codecov]

Codecov Report

❌ Patch coverage is 25.61404% with 212 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
observal_cli/cmd_hook.py	2.04%	48 Missing ⚠️
observal_cli/cmd_sandbox.py	3.22%	30 Missing ⚠️
observal_cli/cmd_mcp.py	25.92%	20 Missing ⚠️
observal_cli/cmd_skill.py	0.00%	20 Missing ⚠️
observal-server/services/mcp_validator.py	12.50%	14 Missing ⚠️
observal-server/api/routes/skill.py	14.28%	12 Missing ⚠️
observal-server/api/routes/mcp.py	9.09%	10 Missing ⚠️
observal_cli/cmd_agent.py	47.36%	10 Missing ⚠️
observal_cli/cmd_prompt.py	23.07%	10 Missing ⚠️
observal-server/api/routes/hook.py	11.11%	8 Missing ⚠️
... and 6 more

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