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4bff655952
Add doc/git-guide.md, a single entry point for the practical Git knowledge needed to contribute to OAI, consolidating the how-tos that were scattered across the documentation: - Setting up commit signing: moved from CONTRIBUTING.md, which keeps the normative DCO/Verified requirements and links to the guide; led by a compact SSH recipe, with the allowed_signers troubleshooting and a note on repository-level configuration for shared servers. - Managing your own branch: moved from code-style-contrib.md, which keeps the workflow policy and links to the guide; mentions git switch and covers fixup commits with git rebase --autosquash, including the --fixup=amend:<commit> variant. - Working with submodules: the update command and the unintended submodule-pointer-update pitfall seen in past PRs. - Recovering from mistakes: git restore --staged, git restore, git reset --soft/--hard, and git reflog. - Reusing conflict resolutions with git rerere: enabling, typical flow, inspecting, seeding from existing history, sharing the cache, and caveats, clarifying that contribution branches must keep a linear history while forks may carry merge commits. The guide is referenced from doc/README.md (Developer tools), code-style-contrib.md, and CONTRIBUTING.md. Guidance coupled to its own document is cross-linked instead of moved: clang-format.md (pre-commit hook), GET_SOURCES.md (branch and tag model), and doc_best_practices.md (docs: commit prefix). Also fix a typo in the T tracer addconsoletrace documentation. Signed-off-by: Andrea Lacava <thecave003@gmail.com>