feat: initial release of transcode.sh v1.0.0

Batch transcode helper for media files using ffmpeg. Encoding parameters
are supplied by user-defined preset files (shell snippets that set an
`ffargs` array) stored under
${XDG_CONFIG_HOME:-$HOME/.config}/transcode.sh/presets/.

Key capabilities:
- Probes input codec and pixel format via ffprobe; derives an output
  pixel format that preserves chroma subsampling and bit depth.
- Per-user and per-invocation codec skip lists to leave already-encoded
  files untouched.
- Atomic in-place replacement: encodes to a temp file in the same
  directory, then renames on success.
- --only-if-smaller: discard the result if it is larger than the
  original.
- --saving: append filename, original/new sizes and percentage saved to
  a log file after each successful encode.
- --dry-run, --verbose, --quiet, --nice and --continue flags.
- Respects the NO_COLOR standard.
- Script hardening: strict PATH, safe IFS, errtrace, nounset, pipefail.

Also included:
- Man page (transcode.sh.1)
- Bash completion script (transcode.sh.bash-completion)
- README.md
- .gitmessage commit message template

License: BSD-3-Clause

1 files changed, 58 insertions, 0 deletions

diff --git a/.gitmessage b/.gitmessage
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+# <type>[optional scope]: <short description>  (max 72 chars total) ------>|
+#
+# Types (choose ONE):
+#   feat      New feature (MINOR bump in SemVer)
+#   fix       Bug fix (PATCH bump)
+#   docs      Documentation only (README, man page, comments)
+#   style     Formatting, whitespace — no logic change
+#   refactor  Code restructure — no feature/fix
+#   perf      Performance improvement
+#   test      Tests only
+#   build     Build system / dependency changes
+#   ci        CI/CD configuration
+#   chore     Maintenance (release commits, tooling)
+#   revert    Revert a previous commit
+#
+# Scopes (optional, in parentheses after type):
+#   core      Main script logic / encode_one()
+#   preset    Preset loading / preset files
+#   color     Terminal color / NO_COLOR handling
+#   cli       Option parsing / help / version output
+#   skip      Codec skip-list handling
+#   saving    File-size savings logging
+#   docs      Documentation (man page, README)
+#   completion Bash completion script
+#
+# Breaking changes: append ! before the colon  →  feat(cli)!: ...
+# --------------------------------------------------------------------------
+
+# [blank line — required before body]
+
+# Body (optional): explain WHY, not WHAT. Wrap at 72 chars.            ---->|
+#
+# Motivation for the change, background, trade-offs considered, etc.
+# Use multiple paragraphs separated by blank lines if needed.
+
+# [blank line before footers]
+
+# Footers (optional):
+#   BREAKING CHANGE: <description of what breaks and how to migrate>
+#   Fixes: #<issue>
+#   Refs: #<issue>, <commit-sha>
+#   Reviewed-by: Name <email>
+#   Co-authored-by: Name <email>
+#
+# --------------------------------------------------------------------------
+# Examples:
+#
+#   feat(preset): add support for passing raw ffmpeg flags via env var
+#
+#   fix(core): prevent tmp file leak when ffprobe exits non-zero
+#
+#   docs: add man page and bash completion script
+#
+#   feat(cli)!: rename --encodefile to --file-list for clarity
+#
+#   BREAKING CHANGE: --encodefile/-f is now --file-list/-F. Update any
+#   scripts or aliases that use the old flag.
+# --------------------------------------------------------------------------