feat: markdown opt-in extra + fix local.lua load order

[4rc0s]

Summary

• Adds lua/whipsmart/plugins/markdown.lua as a new opt-in extra bundling render-markdown.nvim (always loaded) and obsidian.nvim + blink.compat (gated on vim.g.obsidian_vaults being set in local.lua)
• Fixes a load-order bug where pcall(require, 'local') ran before vim.g.have_nerd_font and all vim.o.* defaults, making local.lua unable to override them — the call is now at the end of Section 1
• Updates UNIFIED.md: markdown extra documented, roci migration and load-order fix checked off

Enabling the markdown extra on a machine

In lua/local.lua:

vim.g.obsidian_vaults = { { name = 'personal', path = '~/Obsidian/Main' } }

In lua/custom/plugins/markdown.lua:

require 'whipsmart.plugins.markdown'

render-markdown loads even without obsidian_vaults set — only the obsidian/blink.compat block is gated.

blink.cmp integration notes

blink.compat is added without a version pin (HEAD/main branch) — released tags historically lacked cmp.get_config() that obsidian.nvim calls internally.

The obsidian sources and [[ wikilink trigger behaviour are applied via require('blink.cmp.config').merge_with(...) — the correct v1 post-setup extension API — called from custom/plugins/ (Section 3) after plugins.cmp has already run setup().

Test plan

• Launch nvim with no obsidian_vaults set — no errors, render-markdown active in markdown buffers
• Launch nvim with obsidian_vaults set — obsidian completion sources available via [[
• Type a regular word in markdown — completion menu does NOT auto-open
• Ctrl-Space in markdown — menu opens with full source list
• Non-markdown buffer — completion behaviour unchanged
• Machine without Nerd Font sets vim.g.have_nerd_font = false in local.lua — override takes effect

[4rc0s]

Opened against wrong repo by mistake — intended for 4rc0s/whipsmart.nvim