codemode: restore the graph view and pseudocode comments

Verified live now: ida-codemode 0.3.1 spawns a managed idalib worker on this
box, so the pilot suite runs against the port.

flowchart: the port simply does not have the operation, so domain.get_flowchart
returned None and every graph key reported 'no control-flow graph for this
function'. Ported ours onto ida_gdl (ida-domain exposes no basic-block or
edge-kind surface). Blocks stay address RANGES, never text -- that is what lets
graph boxes reuse the listing's own rows. Graph suite: 0 -> 50 passed.

set_comments: the port set only the disassembly comment via
db.comments.set_at(), so a comment never appeared in the pseudocode. A Hex-Rays
comment is anchored to a ctree location and an anchor the ctree does not own is
discarded as an orphan, so the itp slot must be searched until one sticks, and
the entry ea is a function comment instead. Ported that logic back.

survey_binary: added as the (caught) fallback domain.py expects behind
file_regions, so the fallback path is real rather than always empty.

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