feat: synchronize OpenROAD timing and parasitics

[zhaoxueyan1]

Summary

• use OpenROAD equivalent-cell classification for sizing candidates
• add runtime global-routing RC control and synchronize incremental OpenSTA parasitics
• refresh global-routing parasitics after final OpenROAD repair for a reportable final timing state
• align OpenROAD and nested OpenSTA submodule tracking branches with merge-upstream-master

Validation

• built the updated ECC Sizer with cmake --build build-upstream-merge-ninja -- -j96
• verified recursive submodule gitlinks and configured remotes

Notes

• the OpenROAD build directory remains local and untracked; it is not part of this PR.

[zhaoxueyan1]

@copilot resolve the merge conflicts in this pull request

[Copilot]

Pull request overview

This PR improves ECC Sizer’s integration with OpenROAD/OpenSTA by (1) using OpenROAD equivalent-cell classes (with configurable candidate ordering) for sizing candidates, and (2) adding a -use_gr_rc mode that refreshes/synchronizes parasitics via global routing so final timing reports reflect the post-repair OpenROAD database state.

Changes:

• Add equivalent-cell candidate sorting controls (-equiv_cell_sort) and wire them into library parsing / candidate list ordering.
• Add global-routing RC mode (-use_gr_rc) with parasitics refresh + incremental OpenSTA update support after DB changes and after final OpenROAD repair.
• Update docs, ignore patterns, and submodule tracking branch to align with merge-upstream-master.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
submit/cmd_base_file	Documents new command-file options for equiv-cell sorting and GR RC.
src/timer.cpp	Adds OpenSTA dbNetwork usage and extra null checks when querying cap limits.
src/sizer.h	Adds state + helpers for equiv-cell ordering and GR RC parasitics refresh.
src/sizer.cpp	Implements equiv-cell ordering, GR RC parasitics refresh, and incremental OpenSTA update around DB changes.
src/lib_parser.cpp	Switches footprint grouping to OpenROAD equiv-cell class IDs; filters unsupported/unknown ports.
src/ckt.h	Updates comment to reflect runtime-controlled GR RC selection.
src/ckt.cpp	Rebuilds equiv-cell mappings and updates GR/parasitics flow + OpenDB-driven design read.
src/calc.cpp	Adds defensive null checks around OpenSTA liberty port lookups.
src/analyze_timing.cpp	Adds dbNetwork/liberty port filtering while computing OpenSTA-based violation reports.
README.md	Documents -equiv_cell_sort and -use_gr_rc, including recommended usage guidance.
.gitmodules	Updates OpenROAD submodule tracking branch to merge-upstream-master.
.gitignore	Ignores build-* directories.

Suppressed comments (1)

src/sizer.cpp:5520

• getTranVio() reports transition values normalized by time_unit (ns in this codebase), but this log line labels them as ps. This makes the final report inconsistent with the WNS/TNS units printed just above and can mislead users reading the summary.

    cout << "[view " << view << "] Final Tran after runOrdTO : " << tran_tot
         << " ps " << tran_num << " " << tran_max << " ps" << endl;

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