docs(commits,testing): add merge strategy + multi-pass gate + time-mocking safety

commits.md gets two additions. A new "## Merge Strategy" section makes
squash-merge the default for feature branches and requires explicit
confirmation of the merge approach before pushing or merging. A new
"Multi-pass gate" paragraph in Review and Publish requires every
humanizer-flow pass to run and be named when declaring done, so
silent skips become defects.

testing.md gets a new bullet under "### Determinism": time/clock-mocking
helpers must not recurse against the primitive they're mocking, and must
not let-bind over a defvar — the binding shadows only inside the test
scope, so production code reading the symbol still gets the original
value (silent test miss).

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