[f3rdy]

Summary

Revives the unmerged June draft as #144: top-level aliases for the most frequent workflow action.

• budjira start ISSUE → In Progress, budjira done → Done, budjira block → Blocked, budjira review → In Review (each with --connection/-c)
• Thin wrappers over the existing issue update --status machinery: same case-insensitive transition matching against the issue's available transitions, same required-screen-field handling
• Aliases are non-interactive: a transition needing screen fields aborts with the field list and a hint to the full command; an unavailable transition lists the available ones and points at budjira issue transitions
• The validator-rejection handling (attributing Jira's anonymous messages to screen fields) is lifted into a shared _execute_transition, so aliases report those errors exactly like issue update --status
• Also fixes the pre-existing budjira update issue/transitions wording in hints and docstrings — budjira update is the CLI self-update command; canonical is budjira issue update

Verification

• 1420 tests pass (19 new alias tests: resolution, case-insensitive match, unavailable transition, required-field abort, validator attribution, --connection forwarding, help), ruff + mypy clean
• Independent code review of the diff; both medium findings (validator attribution gap, misleading error hint) fixed and pinned by tests

Fixes #144