Add gitanalyze command and Git-integrity engine; restore README docs and bump manifest to 0.9.6

[NerioVillalobos]

Motivation

• Restore the missing gitanalyze documentation and make the Git-integrity analysis workflow discoverable and usable from the README in both English and Spanish.
• Provide a first-class gitanalyze command that lets pipelines and users evaluate local repository integration risk with deterministic detectors, explainable scoring, and optional AI interpretation.
• Ensure the CLI manifest exposes the new command (and the existing access workflow) and that the plugin metadata reflects the updated version.

Description

• Restored and expanded the gitanalyze documentation in README.md for English and Spanish, updated the top-level workflow count and index entries, and added the access section where missing.
• Implemented the sf metadelta gitanalyze command under src/commands and lib/commands with flags, JSON/Markdown outputs, and AI integration configuration.
• Added a Git-integrity engine under src/git-integrity and lib/git-integrity including extractors, detectors (direct commits, merges, large/huge commits, suspicious messages, chained reverts, history rewrite), scoring, reporting, and AI helper modules, plus a standalone Python script (scripts/git-integrity-standalone.py) for compatibility.
• Updated oclif.manifest.json to include metadelta:gitanalyze and metadelta:access metadata and bumped the manifest/plugin version to 0.9.6.

Testing

• Validated oclif.manifest.json syntax with python -m json.tool oclif.manifest.json, which completed successfully.
• Confirmed README updates and anchors using ripgrep searches (rg) to ensure the new sections and index entries are present, which succeeded.
• Performed basic smoke verification that the README and manifest changes were staged/applied locally (file diffs and presence checks) with no automated unit tests added in this change set.

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Codex Task