updater(fixes): Self-heal hardening and previous commit fix#283
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Description
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Hardens updater self-heal recovery against real git/filesystem faults surfaced by a real-git chaos test.
Changes:
.git/index.lock(age-guarded, >10s) before the recovery reset ingit_reset_to_hash/git_repair, so a SIGKILL'd/interrupted git op no longer permanently blocks runtime self-heal (start.sh only cleared it at boot). Fresh locks (<10s) are preserved so a concurrent legitimate git op is never corrupted..git/HEAD:git_repairre-verifies HEAD after repair (_is_head_readable) and rewrites it viasymbolic-ref(_repair_corrupt_head) instead of trusting fetch success;_reconcile_lockedonly treats a repair as done when HEAD is actually readable.git_has_corruption: "unable to unpack", "inflate: data stream error".Motivation
Devices must self-recover from power-cut/SIGKILL git corruption without a physical reflash. A real-git chaos test found these runtime recovery gaps; this closes them.