chore: register 157 orphan requirement tags found by trace --gaps audit

[SoundMatt]

Summary

Routine requirement/test/doc completeness audit (post v0.5.45 spec-conformance sweep, no known bugs to fix — issue #66 confirmed still open and out of scope as an AUTOSAR/Coverity/CBMC feature request).

• cfusa trace --dir . --gaps against the repo's own source found 157 real //cfusa:req///cfusa:test tags across the ANA, BADGE, BOU, CFG, CYB, DIFF, DISP, FIX, FMEA, IMP, LINT, PR, REQ, RPT, SCI, TRA, UTIL, VULN families referencing requirement IDs that were never registered in .fusa-reqs.json. Registered all 157, with titles/descriptions derived from the tagged code's own doc comment where one exists (e.g. cmd_analyze.c's A003 — signed/unsigned comparison, cmd_cyber.c's CY0nn — CWEnnn: ... lines) or, for test-only tags, from the exercised CLI behavior. Requirement count: 163 → 320, all traced and tested (0 untested, down from 0 already — test-gap count was already zero before and after).
• Deliberately left alone: REQ-GHOST999 is synthetic fixture data inside test_req_trace_cov.c's own dangling-reference regression test, not a real requirement. A handful of bare-word "IDs" (REQ-ID, test, reference, security-test, entry, has, in, matching, no, or) are just cfusa trace's scanner picking up words from usage/help text and explanatory comments sharing a line with a real tag — not annotations of anything.
• Fixed three stale v0.5.0 version references that were never bumped since the initial release: CMakeLists.txt's project() VERSION, and the Project: headers in safety-case.md / tara.md. Now read 0.5.45.

Verification

• --func-coverage 1 in a clean git worktree (no local build clutter): 100% (116/116) function annotation density. The 82% seen in the dirty working tree was stray build_asan//build_fortify/ directories not matched by .gitignore's build-*/ pattern — not a real gap, and not touched by this PR.
• Line coverage via lcov + cfusa coverage --threshold 80: 85.2%, above the CI gate, no regression.
• Full ctest suite: 38/38 passing.

Test plan

• cmake --build build && ctest --test-dir build --output-on-failure — 38/38 pass
• cfusa trace --dir . --gaps — 0/320 requirements untested, zero real orphan tags
• cfusa trace --dir . --func-coverage 1 in a clean worktree — 100% (116/116)
• lcov + cfusa coverage --threshold 80 — 85.2% PASS
• python3 -m json.tool .fusa-reqs.json — valid JSON, 320 unique IDs