v0.12.0 is the clean rolling-bootstrap anchor — the broken v0.11.0->v0.12.0
commit range sits before it, so the replay range (v0.12.0..HEAD) is entirely
native-default with the internal assembler + linker and needs no external tools.
scripts/rolling-bootstrap.sh:
- build_step / smoke_test now compile straight to an executable with the native
default backend (`--source ... --output ...`): no --emit-ir, no QBE, no gcc.
- Dropped the QBE_BIN requirement and the QBE= make var from the RTL build.
.github/workflows/bootstrap.yml:
- STAGE1_TAG v0.10.0 -> v0.12.0 (the new cold-start anchor).
- Removed the "Build QBE" and "Expose QBE to the compiler" steps and the QBE=
make var from the -pre RTL rebuild — the bootstrap chain no longer needs them.
- Branch-scoped validate-only triggers (ci/**, feature/**, bootstrap/**) and
master-only cache writes were already in place (Step 3d-bis).
These reference the v0.12.0 tag/release asset, which the cut creates next.
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