restore Ghost grounding across agent handoffs

[nahiyankhan]

Category: improvement
User Impact: Agents can restore the same Ghost grounding after a context handoff without repeating selection.
Problem: Pulling previously selected IDs restores their node bodies but not the package cover that gather placed in context. Running gather again exposes the menu and can invite a receiving agent to select a different set.
Solution: Add ghost pull --with-cover, which resolves and prepends the package cover while preserving the supplied IDs. The skill now uses this path after compaction or a session handoff and keeps any generated no-guidance instruction alongside the handoff.

Validation:

• pnpm run quality:all: passed; 218 workspace tests passed, with existing non-blocking Biome and package-validation warnings
• pre-commit and pre-push hooks: passed

Changeset: added as a minor release because this adds a public CLI flag.

ghost Review:

• ghost check --base main: not run because the current CLI has no check command
• ghost review --base main --include-memory: not run because the current CLI has no --include-memory option and this repo's package review requires applicable local checks

File changes

.changeset/restore-handoff-grounding.md
Records the new public pull capability as a minor release.

packages/ghost/src/commands/pull-command.ts
Adds --with-cover, resolves the current package cover, prepends it to the requested IDs, and warns when no cover resolves.

packages/ghost/src/skill-bundle/references/ground.md
Teaches agents to preserve selected IDs and restore them with the resolved cover without reopening selection.

packages/ghost/test/cli.test.ts
Covers cover restoration, output ordering, event attribution, missing-cover behavior, and installed skill wording.

Screenshots/Demos: N/A; no visual surface changed.