docs: add unmerged commits table and workflow description

Explain that commits are spun off as separate PRs and this branch
is rebased as they merge.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Author: oharboe

bazel-orfs.md

@@ -179,6 +179,21 @@ actual `eqy` tool invocation is gated by a separate `RUN_EQY`
 variable (default 0), so builds don't fail when eqy is not installed.
 CI sets `RUN_EQY=1` when eqy is available.
 
+## Workflow: Unmerged Commits
+
+This PR serves as a working branch against master. Commits here are
+spun off as separate, focused PRs for review. Once a PR merges, this
+branch is rebased on master to drop the merged commit. The branch is
+force-pushed after each rebase so the PR commit list is always the
+source of truth for what's pending.
+
+Filing of PRs is throttled to avoid overwhelming maintainers --
+submitting too many at once just causes "maintainer packet dropping"
+where reviews stall.
+
+Additional PDKs are throttled until asap7 and sky130hd are
+essentially clean and no longer need fix-up commits in this PR.
+
 ## Known Limitations
 
 - Only asap7 and sky130hd PDKs are wired up (others can be added to