probbit 0.8.0: release patches (floor lift in log space, cap rounding, MCP annotation, plain monitor output, README labels)

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Extreme goal fields could erase a declared odds floor or produce an infinite lift. Compute the lift with max-shifted log-sum-exp, and report floor proofs as unknown when checked field bounds leave the normal exponential range. The negative- and positive-field checks now both return safety odds 0.100001 with a finite lift.

Accept the half-unit tolerance needed to read six-decimal states written at higher-precision caps. Mark probbit_live_event as mutable and non-destructive, strip control characters from plain monitor frames, and label Drives and monitor as 0.8.0, unreleased in the README.

Validation:

• Reproduced the floor, state continuation, MCP annotation, terminal output and README issues before the changes; the same checks pass afterward.
• Added checks for extreme fields, JSON and human proof output, rounded state continuation, cap tolerance, MCP strand writes and plain frames with C0/C1 controls.
• Release-mode workspace checks: 249 tests pass, one existing test ignored. The monitor suite was rerun with TERM=xterm-256color because TERM=dumb forces ASCII in its Unicode check. All 11 MCP tests pass.
• All 25 existing golden/fixture files remain byte-identical. The README diff contains only the two heading labels.
• No dependency or workflow changes.