ingitdb / ingitdb-cli / 25797828871

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feat(cli/drop): implement --remote via Git Data API (one atomic commit)

Drop now accepts --remote/--token/--provider with the same grammar as
every other verb. Unlike the per-file Contents API used by FileReader,
the remote drop path uses GitHub's Git Data API (blobs/trees/commits/
refs) so a collection drop that touches N files lands as exactly one
commit — honoring spec REQ:one-commit-per-write even when --cascade
drops multiple objects.

New: pkg/dalgo2ghingitdb/tree_writer.go
  - TreeChange{Path, Content []byte} — Content=nil means delete.
  - TreeWriter.ListFilesUnder(ctx, dir) — recursive tree walk with
    prefix filter; errors on truncated trees so partial views are
    never trusted.
  - TreeWriter.CommitChanges(ctx, msg, []TreeChange) — assembles a
    new tree from the base, creates the commit, updates the ref;
    returns the new commit SHA. Errors before any I/O on empty
    changes or empty message.
  - resolveBranch — honors cfg.Ref or falls back to the repo's
    default branch via Repositories.Get.

New: cmd/ingitdb/commands/drop_remote.go
  - dropCollectionRemote: read .ingitdb/root-collections.yaml,
    enumerate every blob under the collection's directory, build one
    TreeChange batch with the file deletions plus the rewritten
    root-collections.yaml, commit.
  - dropViewRemote: read root-collections, scope by --in or scan all
    collections, read the view file to discover its file_name for the
    materialized output, commit both deletions atomically. Ambiguous
    view names error out the same way as the local path.
  - Both honor --if-exists for idempotent "already gone" semantics.

Wiring:
  - cmd/ingitdb/commands/drop.go now registers --remote/--token/
    --provider as persistent flags; each subcommand's RunE rejects
    --path with --remote, then dispatches to the remote helper when
    --remote is set.
  - cmd/ingitdb/commands/seams.go adds the treeWriter interface and
    treeWriterFactory seam so tests can substitut... (continued)

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