Feat - #6

…d orchestrator consolidation

- #1 (Blocker): Fail loud with exit code 1 on git errors, budget cap breaches, and gh CLI errors across pr-summary and changelog CLI commands.
- #2: Prevent duplicate printing when no changes/commits exist by early returning None.
- #3: Route diagnostic warnings, budget alerts, and error messages to stderr console (err_console) to keep stdout clean for Unix piping.
- #4: Correctly parse and surface breaking changes (exclamation mark and BREAKING CHANGE: footers) in conventional commits and templates.
- #5: Bump changelog template to version 2, including from_ref..to_ref range and explicit release headers.
- #6: Support --title (-t) flag in pr-summary and propagate gh pr create failures.
- #7: Remove dead head argument from fallback PR summary.
- #8: Consolidate duplicate budget checking, safe telemetry recording, and heuristic token counters into orchestrator.py.
- #9: Enforce strict type hints with CommitLogEntry in fallback.py.