docs: refresh MAP.md and README for map/dup initiative

[srobinson]

Final docs round of the fmm map/dup initiative. Regenerates MAP.md per MAP.SKILL.md and brings README.md current for the user-visible commands/flags shipped this session. Docs-only; no code changes.

MAP.md (regenerated at 29990d0, was 805ae4c)

• Real cycles surfaced. fmm cycles now hides module-hierarchy facades by default, so the Seams section shows genuine coupling: resolver/deno.rs ↔ resolver/workspace.rs (real mutual use) and format/search_formatters.rs ↔ cli/commands/dupes.rs (a by-name matcher artifact — search_formatters imports crate::dupes::DupeClustersResult from core's dupes.rs, and the basename collision with the CLI's dupes.rs draws a phantom core → cli edge that cannot be a real import).
• Duplication candidates subsection added to Health via fmm dupes (8 clusters; the signature_end_byte triplication is the genuinely consolidatable one; VERSION and the per-language trait impls are candidates, not verdicts).
• Trait method signatures in the boundary descriptions (via fmm outline), reverse-transitive blast radius (via fmm deps --reverse --transitive), and precise importers (via fmm glossary --exact).
• Refreshed topology (434 files / 67,011 LOC), the new fmm-core dupes module, and GitMeta on the FmmStore port.

README.md (minimal, accurate)

• New fmm cycles and fmm dupes commands; new fmm_dupe_clusters MCP tool (10 → 11 tools).
• New flags: exports --filter {all|source|tests}, glossary --exact, deps --reverse --transitive, generate --sha/--no-git.
• fmm status now reports git metadata; fmm cycles default-behavior change documented.

MAP.SKILL.md (small accuracy tweak)

• Duplication section now points at the shipped fmm dupes repo-wide scan instead of describing it as a planned primitive.

Every command/flag documented was verified against fmm <cmd> --help. Code referenced by path + symbol, never line numbers.