test(scheduler-sim-diagnostics): close cross-cutting gaps for Requirement 6 (task 10.2)

Final validation task for the Human-Readable Units increment (tasks
7-10.1). Adds three tests closing gaps no prior task's own tests
covered:

- Cross-surface consistency (Requirement 6.5): a single info limit
  request against a byte-valued limit with both a configured setting
  and a live usage instance shows the SAME units convention in both
  lines, across mode switches -- neither task 8.2's nor task 9's own
  tests combined both surfaces in one capture.
- Non-byte-valued exclusion (6.3): a new "slots"-resourced fixture
  (the first non-"mem" fixture in this file) proves the entire
  combined display is byte-for-byte identical across all three units
  modes.
- Percentage exclusion (6.3) at the REPL-dispatch level: a percent
  limit's own percentage value survives real repl_dispatch()/
  set-units switching unchanged, complementing test_limit.c's
  existing library-level proof of the same invariant.

Full regression sweep: lib suite 368/368, scheduler suite 85/85,
including test_repl_limit_table.c (35/35), test_repl_resource_table.c,
test_repl_resource_formatting.c, and test_limit_plugin.c all
unaffected. No production code changed. This closes out Requirement 6
(ACs 6.1-6.5) and reconfirms Requirement 5 (ACs 5.1-5.3) end-to-end.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RLSNJhNoULvVcUhXEFafQC

.kiro/specs/scheduler-sim-diagnostics/tasks.md

@@ -107,7 +107,7 @@
   - _Requirements: 6.1, 6.3, 6.4_
   - _Depends: 9_
 
-- [ ] 10.2 Confirm units consistency, exclusion rules, and zero regression end to end
+- [x] 10.2 Confirm units consistency, exclusion rules, and zero regression end to end
   - A byte-valued limit's configured-setting display and its live usage display agree on units under every display mode, within one request for that limit's information
   - A limit whose constrained resource is not byte-valued, or whose own configured value is itself a percentage, is never subject to byte-unit scaling in either display
   - The complete pre-existing `info limit` test suite, and the complete pre-existing suite for every other `info` subcommand — including the two pre-existing, non-limit displays that share the same underlying formatting logic this requirement set retyped in task 7 — show zero output differences beyond what this requirement set intends