Addresses the bot's follow-up review findings on the settlement-path fixes:
- The _LogStream seal joined the WHOLE accumulated buffer past the fragment cap,
re-copying the growing block O(B^2/cap) times for a large drip. It now seals
only the current fragments into a _pending_blocks entry (character count
unchanged), so a 25 M single-character drip stays O(B); the newline/flush/
_push_bounded_prefix consumers join blocks + fragments once.
- The _clamped soft==hard lowering is scoped to RLIMIT_CPU: for RLIMIT_AS a
one-byte soft differential would only misalign the child's applied limit with
the host-side budget gate, with no signal to preserve. The hard == 1 blind
spot is documented.
- send_done's fallback captures memoryview at import (_memoryview) alongside
os.write, so a one-line rebind of the name cannot change the fallback write;
the comment now states the module-level-captured mechanism.
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