chore: default off CLL full map cache

[wcchang1115]

PR checklist

• Ensure you have added or ran the appropriate tests for your PR.
• DCO signed

What type of PR is this?

chore

What this PR does / why we need it:

Changes the pre-cached full column-level lineage map (build_full_cll_map) to be disabled by default. Previously, get_cll() would eagerly build the entire project's CLL map upfront and slice from it. Now it uses the per-node path by default, avoiding the upfront computation cost for large projects.

• Renamed CLI flag from --disable-cll-cache to --enable-cll-cache (env: ENABLE_CLL_CACHE)
• Default: cache OFF (per-node CLL computation)
• Opt-in: recce server --enable-cll-cache to restore previous behavior

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

• Only recce/cli.py is changed — the get_cll() method signature and disable_cll_cache parameter are unchanged
• Frontend never sent full_map, so no frontend impact
• MCP server calls get_cll() directly without the flag, so it already used the per-node path
• Existing tests parametrize both cached and uncached paths via the disable_cll_cache fixture, no test changes needed

Does this PR introduce a user-facing change?:

The --disable-cll-cache CLI flag is replaced by --enable-cll-cache. The CLL full map cache is now off by default.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
recce/cli.py	66.66%	1 Missing ⚠️

Files with missing lines	Coverage Δ
recce/cli.py	52.76% <66.66%> (ø)

... and 6 files with indirect coverage changes

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[kentwelcome]

LGTM