Freegle / Iznik / 23443

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fix(worktrees): make host-scripts file-sync + rebuild worktree-aware

The host-scripts container's file-sync.sh already reads
COMPOSE_PROJECT_NAME (CN), but the compose service never put that var in
the container's environment (only CI), so in a worktree CN fell back to
"freegle" and every docker cp synced into the MAIN instance's containers
(e.g. freegle-batch, bind-mounted to the main checkout). That silently
polluted the main checkout with worktree edits, and the Bash worktree-escape
hook cannot catch it because the copy is done by a daemon, not a Bash command.

- Pass COMPOSE_PROJECT_NAME=${COMPOSE_PROJECT_NAME:-freegle} into the
  host-scripts service so file-sync.sh targets ${CN}-batch (the worktree's
  own container).
- De-hardcode the rebuild monitor's `docker-compose -p freegle` to
  `-p "${COMPOSE_PROJECT_NAME:-freegle}"` so worktree rebuild-requests
  rebuild the worktree project, not main.

On the main instance COMPOSE_PROJECT_NAME=freegle (from .env), so behaviour
is unchanged. Verified in a worktree: the live host-scripts env now resolves
to the worktree project and a test edit syncs only to the worktree batch
container, not freegle-batch.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GXcePaRCXEvJE62gFZvivy

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