Every direction on the front door stops mid-word: "(serve a dep" #187

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Fixes the direction issue title cut: ensureDirectionIssue in src/crew/autonomy.ts hard-sliced the direction at 120 characters, so long directions ended mid-word (e.g. "(serve a dep") with no sign there was more.

• Added truncateAtWord(text, limit), a small pure function that cuts at the last word boundary, strips a dangling (, and appends …. Text that already fits is returned unchanged.
• The "Direction: " prefix and the 120-character budget are now named constants (DIRECTION_PREFIX, DIRECTION_TITLE_LIMIT); the budget is capped against MAX_TITLE from src/core/issues.ts so the whole title can never exceed it.
• The Direction: prefix itself is untouched, so the planner's lookup by prefix still works.
• Tests in test/autonomy.test.ts: a 40-char direction passes through whole; a 200-char direction is cut with a trailing …, stays within the limit, and never splits a word or leaves a dangling (.

Left out: already-stored direction issue titles are not rewritten — this only changes titles for directions written from now on. A person can rename an old one if they care.

bun test and tsc --noEmit are green for my changes; two pre-existing failures in test/apps.test.ts (crew agent / restart-rebuild tests) reproduce identically on main without this change, so they're unrelated flakiness, not something this pull introduces.

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Closes #179