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feat(compiler): key server-function ids on identity, not position (#3109)

Production ids were `<xxhash32(path)>-<ordinal>`, so appending a server
function to a file renumbered the rest and clients holding the old
numbering silently dispatched to different code with a 200. Ids are now
`<name>-<xxhash32(root-relative path)>`, with a trailing ordinal only
when the same descriptive name recurs in one file: appends, deletes,
reorders, and body edits move no address, and a removed or renamed
function becomes a clean 404 instead of a wrong call. Development and
production now share the exact same id format.

Frozen directive fixtures regenerated deliberately per their README; the
diff is id literals only.

Co-authored-by: Cursor <cursoragent@cursor.com>

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