specs/fpga: test checks written as 'invariant <expr>;' become then/and assertions

[dmitrii-f-t27]

Closes #5730

In two FPGA specs, braceless tests ended in invariant <expr>;. That keyword opens a new top-level invariant, so the parser closed the test, named a stray invariant r or total, and discarded the expression. Six tests ran their setup and asserted nothing; t27c gen emitted eight // invariant: r NOT CHECKED stubs.

• Each invariant <expr>; is now then <expr> / and <expr> in its own test. The 9 expressions are unchanged.
• parse-complete --show: power_analysis 3 -> nothing discarded; vcd_conformance_compare 38 -> nothing discarded.
• t27c gen of vcd_conformance_compare: NOT CHECKED stubs 8 -> 0; r.total_checks == 1 assertions 0 -> 3. power_analysis gains total > 0.
• Typecheck unchanged (power_analysis OK 0 warnings; vcd_conformance_compare OK 1 warning). Zig ast-check 0 errors before and after. test-report is BLOCKED on both before and after by the same pre-existing errors outside the changed lines.
• The four seals regenerated with the t27c built from this tree; --verify reports all hashes MATCH.
• Both parse-no-discard entries removed from docs/reports/suite_expectations.json; local t27c suite --ratchet --corpus-only: RATCHET CLEAN.

🤖 Generated with Claude Code

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Generated at: 2026-10-03 10:17:25 UTC

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Summary

Status	Count
Total Open PRs	42
PRs with Failing Checks	37
PRs with All Checks Green	5
READY	1
FAILING	37
PENDING	0
NO CHECKS YET	0

These columns do not partition: 1 + 37 + 0 + 0 = 38, and there are 42 open PRs. A PR is being counted twice or not at all.

Seal Status

• ⚠️ STALE -- sha256(compiler.rs)=b45a356c2eb6 != manifest seal=87e5cbd3ad94.
  The committed NMSE numbers were certified against an older compiler.rs.
  Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).