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feat(cse-machine): support breakpoint() as a breakpoint-navigation marker (#256)

* feat(cse-machine): support breakpoint() as a breakpoint-navigation marker

Registers breakpoint() as a no-op MISC builtin (chapters 1-4) and, in the
CSE machine's step generator, detects a zero-arg call resolving (by
identity, so aliases like `bp = breakpoint; bp()` are caught too) to that
builtin, recording the step where it sits on top of the control into
context.runtime.breakpointSteps. Threads that array out through
collectSnapshots and PyCseEvaluator's sendSnapshots call so the host's
breakpoint-navigation controls can consume it (paired with a protocol
change in source-academy/plugins to carry it across the Conductor
__cse channel). Mirrors PR #197's substitution-stepper support of the
same feature (issue #189).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* chore: revert local yarn-link dev scaffolding for cse-machine packages

package.json/yarn.lock were pointing @sourceacademy/common-cse-machine and
@sourceacademy/runner-cse-machine at a local yarn-link portal
(/home/vakshay/plugins) for development. That doesn't resolve for anyone
else or CI, and runner-cse-machine can't be pinned to a plugins branch via
Yarn's git+workspace protocol either — like web-cse-machine, it depends on
the sibling common-cse-machine workspace via workspace:*, and Yarn's
single-workspace git fetch doesn't build sibling workspaces first, so the
prepack/rollup step can't find its dist.

Reverting to the original published semver ranges so this PR's dependency
diff is clean. This PR depends on source-academy/plugins#55 (adds
breakpointSteps to the CSE snapshot protocol) publishing a new npm
version before it will typecheck/build against real installs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* chore: bump cse-machine deps to the published versions with breakpointSteps

@sourceacademy/common-cse-machine ^0.2.0 -> ^0.3.0 and
@sourceacademy/runner-cse-machine ^... (continued)

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