Folds `josh-sync adopt` into `josh-sync onboard <target>` as the adopt strategy alongside the original reset flow. Strategy resolves by precedence: --mode flag > targets[].history_lock config (preserve|rewrite) > auto-detect via `git ls-remote --heads`. `josh-sync adopt` is kept as a thin alias. Adds the new `targets[].history_lock` config field (validated at parse time) and folds `<target>/adopt.json` state into `<target>/onboard.json` with a `.strategy` field; legacy state files are read with a backward-compat fallback. Safety hardening (from a multi-angle review of the unification): - auto-detect distinguishes auth/network failure from empty repo - resume validates --mode against the strategy saved in state - `josh-sync adopt` rejects a conflicting --mode in the forwarded args - missing import-PR lookup dies in both strategies (was WARN+continue for reset, which could create duplicate import PRs on resume) - --restart durably removes the legacy adopt.json from the state branch - adopt_branch is now a subshell function (EXIT trap can't clobber callers) - strategy value validated after resolve/load (reset|adopt) - --mode with missing/empty value dies with a usage hint - migrate-pr against an adopt-strategy target dies with a specific hint - reset importing asserts archived_url is present (no "null" → git clone) End-to-end + CLI bats coverage added (tests/unit/adopt_e2e.bats, tests/unit/cli.bats). 72 tests, shellcheck clean. Makefile dist bundle header now correctly interpolates VERSION and line count. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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