bazel-orfs: bump to 6ebadeb (yosys/abc 0.64 via custom registry)

[oharboe]

Summary

• Bumps BAZEL_ORFS_COMMIT to 6ebadeb, which pins yosys to 0.64 to pick up the Kogge-Stone adder memory-corruption fix that triggered ABC SIGSEGVs under yosys 0.63.
• Drops the vendored render_gds PDK_CONFIGS patch (and the now-empty patches/bazel-orfs/ dir) — the fix landed upstream in bazel-orfs bfd3a1d.
• Mirrors bazel-orfs/.bazelrc's --registry= lines into root .bazelrc so yosys 0.64 resolves from the unmerged BCR PR (bazelbuild/bazel-central-registry#8862) fork until that PR lands. ORFS has its own .bazelrc, so bazel-orfs's lines don't propagate automatically. abc 0.64-yosyshq.bcr.1 is already on official BCR; only yosys 0.64 needs the fallback.

Test plan

• bazelisk mod graph resolves yosys@0.64 + abc@0.64-yosyshq.bcr.1
• bazelisk test //flow/designs/asap7/... --keep_going — mock-alu (kogge-stone exerciser) PASSED with yosys/abc 0.64
• CI run on this PR

Local test summary (9 pass / 7 metric-fail / 2 fail-to-build)

Result	Tests
PASS	aes, aes-mbff, cva6, ethmac_lvt, gcd, gcd-ccs, jpeg, mock-alu, mock-cpu
rules-base.json metric-miss (synthesis output shift from yosys 0.64; regenerate via make update_ok)	aes_lvt, ethmac, ibex, jpeg_lvt, riscv32i, swerv_wrapper, uart
PDN-0233 at floorplan (failed to build)	aes-block, riscv32i-mock-sram

The PDN-0233 failures are at floorplan/PDN (post-synthesis) so they are not caused by yosys; flagging here for follow-up since they reproduce on this branch.

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request updates the bazel-orfs dependency to a newer commit, removes a previously vendored patch that has been merged upstream, and configures fallback Bazel registries to accommodate Yosys 0.64. Feedback indicates that the Yosys update has introduced synthesis shifts resulting in "metric-miss" test failures and build regressions (PDN-0233). It is recommended to include the necessary baseline updates and address these build failures within this PR to ensure CI remains green.

[gemini-code-assist]

The pull request description indicates that 7 tests are failing with a "metric-miss" due to synthesis output shifts introduced by Yosys 0.64. These baseline updates (e.g., to rules-base.json) should be included in this pull request to ensure that the CI remains green and the repository stays in a consistent state.

[gemini-code-assist]

The 2 "fail-to-build" (PDN-0233) errors mentioned in the summary represent a regression in the build process. Synthesis changes from the Yosys 0.64 bump can impact downstream stages like floorplanning and PDN. These failures should be addressed to ensure that all designs in the test suite continue to build successfully.