jr_isolate has been unusable since Phase 26 — its own docstring says "BLOCKED on
split_src_region". Five distinct defects, each found only after fixing the one above it:
1. split_src_region demanded an address for EVERY top-level item, but an overlay .c is
full of address-less constructs (hoisted typedef blocks, per-function extern runs,
comment banners). coalesce() now merges an address-less run FORWARD into the item
below it — they are a preamble belonging to that function, which is §431's model.
2. coalesce re-derived the name from the MERGED text, so item_name matched the preamble
instead of the function. It now carries (addr, name, text) captured before the merge.
3. item_name scanned COMMENTS as if they were code: a comment containing any
parenthesised token won over the real definition below it.
4. item_name matched a leading "extern void (*D_x[])(void);" and returned the name
"void" — the §192 class, which gate_main.sym_of fixed for itself and this tool never
got. A real function was then treated as a preamble and merged into its neighbour,
leaving its body inside another item while its own stub survived: 26 duplicate
symbols in one overlay. It now anchors on a DEFINITION (ends in an open brace, not a
semicolon) and refuses type keywords as names.
5. That definition anchor required column 0, so an INDENTED top-level body was invisible.
Also: jr_isolate's idempotency check keyed on the CONFIG, which it writes FIRST, so any
failure in between left a half-applied tree the tool believed was finished. It now
requires the source file too and refuses with recovery instructions. And inject accepts
"already present and textually IDENTICAL" — splat emits an empty function as C, not as a
stub — while still failing hard when the destination defines it DIFFERENTLY.
Progress on ov_SC02_005: trim went 78 kept / 231 moved -> 89 / 255; duplicate symbols
26 -> 0; the chain now runs to completion (rc=0).
NOT DONE: the object still fails to assemble on a remaining duplicate-definition class.
Tree restored, ov_SC02_005 BYTE-IDENTICAL.
Drew T