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test(boot): extract partition_fixup decision tree (TA-234) (#198)

eleventh target of the TA-234 seam-for-testability pass. partition_fixup_check
mixed a small "should we fix?" decision tree with a lot of esp_flash_read /
write / erase plumbing. extract just the decision into
partition_fixup_decision.{c,h}:

  partition_fixup_decide(expected_table, len, live_ok, live_table,
                         running_addr, expected_ota_0_addr)
  → { action, needs_app_copy, needs_table_rewrite }

actions: SKIP_NO_TABLE, SKIP_TABLE_MATCHES, NEEDS_REWRITE_ONLY,
NEEDS_COPY_AND_REWRITE.

partition_fixup.c reads the live table + running address, calls the helper,
dispatches the action via switch. flash I/O unchanged.

7 host tests cover the four action branches plus defensive cases (live
read failed, expected table empty/short, running addr 0).

high-stakes code (boot recovery from foreign partition tables on
factory-flashed devices) now has explicit regression coverage.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

261 of 320 branches covered (81.56%)

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806 of 825 relevant lines covered (97.7%)

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