Redesign the get/multi-get retrieval surface so callers can cite what
they retrieved and request follow-up slices without piping through sed:
- Output is line-numbered by default; opt out with --no-line-numbers.
- Header always identifies the document by qmd:// path + #docid. The
MCP get/multi_get tools default lineNumbers=true to match.
- qmd get and the MCP get tool accept a :from:count suffix on a path
or docid (e.g. '#abc123:120:40' reads 40 lines from line 120).
Explicit --from/-l flags still override the suffix.
- qmd multi-get now includes #docid in every output format (--md,
--json, --csv, --xml, --files, default CLI), matching qmd search.
- New --full-path flag swaps the qmd:// + docid header for the
document's on-disk path (handy for piping into Read/Edit/editors);
falls back to the canonical header when the file no longer exists.
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