GF8/20/24/32 specs: prose invariants are discarded by the parser and check nothing

[dmitrii-f-t27]

t27c parse-complete (master 8fdf715) reports four GF format specs whose invariants are partly prose, so the parser drops them and the generated code checks nothing for them:

spec	tokens discarded	lines
specs/numeric/gf8.t27	37	456, 459, 477, 519
specs/numeric/gf20.t27	31	427, 430, 438
specs/numeric/gf24.t27	31	427, 430, 438
specs/numeric/gf32.t27	31	438, 441, 449

The dropped lines are assert pow(x, 0.0) == 1.0 for all positive x, assert pow(x, 1.0) == x for all valid x, assert floor(x) == i32 for all f32 x and (gf8) assert PHI_DISTANCE == 0.132 within 0.001. Each invariant keeps its name, so it looks checked, while its body is gone.

Boundary

• specs/numeric/gf8.t27
• specs/numeric/gf20.t27
• specs/numeric/gf24.t27
• specs/numeric/gf32.t27
• .trinity/seals/GF8.json, .trinity/seals/GF20.json, .trinity/seals/GF24.json, .trinity/seals/GF32.json
• .trinity/seals/numeric_GF8.json, .trinity/seals/numeric_GF20.json, .trinity/seals/numeric_GF24.json, .trinity/seals/numeric_GF32.json

User Scenarios & Testing

• Given specs/numeric/gf8.t27, When t27c parse-complete --show reads it, Then it reports nothing discarded.
• Given the rewritten invariants, When t27c gen emits Zig, Then each invariant body is an executable check at concrete points.

Requirements

• FR-001: Every invariant in the four specs must be written in t27 the parser consumes, with no discarded tokens.
• FR-002: A quantified claim must be checked at concrete points, and the comment must say which.
• FR-003: The seals of the four specs must be regenerated with the t27c built from the PR's own tree.

Success Criteria

• t27c parse-complete --show specs/numeric/gf8.t27 prints nothing discarded (today: 37 token(s) DISCARDED).
• t27c parse-complete --show specs/numeric/gf32.t27 prints nothing discarded (today: 31 token(s) DISCARDED).
• t27c gen specs/numeric/gf8.t27 | grep -c 'abs(pow(x1, 0.0) - 1.0)' prints at least 1 (today: 0).
• t27c typecheck specs/numeric/gf8.t27 prints Typecheck OK (0 errors, 12 warnings) (today: the same).