Release v0.20.0 (#928)

Author: abhinav

.changes/unreleased/Added-20251019-135718.yaml

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+## <a name="v0.20.0">v0.20.0</a> - 2025-11-03
+### Added
+- commit: Add '--signoff' flag to add Signed-off-by trailer to commit messages. Enable for all commits with the 'spice.commit.signoff' configuration option.
+- branch create: Add 'spice.branchCreate.generatedBranchNameLimit' configuration option to customize the length of branch names generated from commit titles.
+- submit: Add 'spice.submit.navigationComment.downstack' configuration option to control whether merged CRs appear in stack navigation comments.
+
+### Changed
+- all: --help messages now include configuration options for each command.
+- submit: CR creation title prompt now allows choosing from the titles of all available commits instead of always using the first. Use up/down arrow keys to navigate.
+- submit: The prompt to confirm submission of empty branches now also considers branches with non-zero commits but no effective changes. This helps catch submission of empty commits or entirely reverted changes.
+
+### Fixed
+- repo sync: Avoid prompting to delete branches that have both merged and open externally created CRs -- assume the user wants to keep the branch.
+- Fix data race in reading GraphQL responses from GitHub where buffers could be reused while response bodies were still being read.
+- Fix crash when information for a branch could not be loaded from Git.