Wiki Merge

Consolidate two pages into one (merge), or separate one overloaded page into qualified pages (split). Both operations rewrite the link graph, so they are deliberate, confirmed, and verified — never automatic.

The slug is the concept's identity (see the Concept Identity section of SCHEMA.md). Merge and split are how identity changes safely: every inbound [[slug]] is rewritten so no link is left resolving to nothing.

Pre-condition

Find SCHEMA.md (search from cwd upward, or ~/wikis/). If not found, tell the user to run wiki-init first. Read it to get the wiki root path and the Concept Identity convention.

Choose the operation

• Merge — two slugs name the same concept. Goal: one surviving page, the other gone, all links pointing at the survivor.
• Split — one slug overloads distinct senses (a homonym, or a page that grew two unrelated subjects). Goal: two qualified pages, each inbound link repointed to the correct sense.

If unsure which, describe both pages to the user and confirm before proceeding.

Merge

1. Identify survivor and loser

Present both pages and recommend which slug survives. Prefer the slug that is: more specific and correct, more linked-to, or already the better-developed page. Confirm the choice with the user before writing anything.

Survivor: [[<survivor-slug>]] — <why> Loser: [[<loser-slug>]] — folded in, then deleted

2. Fold content into the survivor

Read both pages in full. Merge the loser's content into the survivor:

• Combine sections; do not duplicate facts already present.
• Preserve every citation. Carry footnotes over, renumbering sequentially. Never drop a footnote during the fold — a merged claim keeps its provenance.
• Union the frontmatter sources lists; keep the broader/more-correct title, category, summary, and tags.
• Keep the earlier created date of the two; bump the survivor's updated date.

Show the proposed survivor page as a diff and confirm before writing.

3. Rewrite all inbound links

Grep every page in wiki/pages/ and overview.md for [[<loser-slug>]] (skip index.md — it is generated and will be rebuilt). Rewrite each to [[<survivor-slug>]]. Watch for:

• A page that linked to both — collapse to a single link, fix surrounding prose.
• Link text/aliases that named the loser — update the wording to read naturally.

Show the list of affected pages and the edits; confirm before writing.

4. Delete the loser page and regenerate the index

Remove wiki/pages/<loser-slug>.md. Do not touch index.md by hand — regenerate it so the loser's entry disappears and the survivor's reflects its merged frontmatter: python bin/generate-index.py.

5. Link-resolution sweep

Grep the whole wiki for [[<loser-slug>]] — there must be zero matches left. Then confirm every [[slug]] on the survivor page resolves to a real page. Fix any stragglers before finishing. (This is the same inline check wiki-ingest runs; a merge that leaves a dangling link defeats its own purpose.)

6. Update overview and record the operation

If the merge changes the synthesis (e.g. a duplicated "Key Concept" becomes one), update wiki/overview.md. Then record the operation per SCHEMA's Operation Log & Commit Convention:

• Git wiki: suggest a commit (default refactor: for a merge, plus the trailer) and commit on confirmation.

  refactor: merge <loser-slug> into <survivor-slug>
  
  Wiki-Op: merge

• Non-git wiki: append to wiki/log.md:

  ## [<today>] merge | <loser-slug> → <survivor-slug>
  Inbound links rewritten: <N> across <list of pages>

Split

1. Define the senses and slugs

Identify each distinct sense the overloaded page conflates. Propose a qualified slug per sense, following the disambiguation convention in SCHEMA.md (narrowest discriminator that disambiguates):

[[transformer]] overloads two senses →

• [[transformer-ml]] — the neural network architecture
• [[transformer-electrical]] — the power-grid device

Decide what happens to the original bare slug:

• Retire it (most common): both senses move to qualified slugs; the bare slug is deleted and every inbound link repointed.
• Keep it as the primary sense: one sense stays on the bare slug, the other moves out.

Confirm the slug plan with the user before writing.

2. Create the qualified pages

Write each new page with the content for its sense only, with full frontmatter (title, category, a distinct one-line summary, tags, created: <today>, updated: <today>). Split the frontmatter sources so each page lists only the sources that actually support it. Carry the relevant footnotes to each page, renumbering sequentially. Show each new page and confirm before writing.

3. Repoint inbound links per sense

Grep every page in wiki/pages/ and overview.md for [[<original-slug>]] (skip the generated index.md). For each occurrence, decide which sense it meant from its context and rewrite it to the correct qualified slug. This is the judgment-heavy step — do not blanket-replace. When a single page referenced both senses, split it into two links.

Show each repointing decision (link, surrounding context, chosen target) and confirm before writing.

4. Remove or repurpose the original

If retiring the bare slug, delete wiki/pages/<original-slug>.md. If keeping it as the primary sense, trim it to that sense only and bump its updated date. Then regenerate the index so the removed/added pages are reflected — do not hand-edit index.md: python bin/generate-index.py.

5. Link-resolution sweep

If the bare slug was retired, grep the whole wiki for [[<original-slug>]] — zero matches must remain. Confirm every [[slug]] on the new pages resolves. Fix any stragglers.

6. Update overview and record the operation

Update wiki/overview.md if the split changes the synthesis. Then record the operation per SCHEMA's Operation Log & Commit Convention:

• Git wiki: suggest a commit (default refactor: for a split, plus the trailer) and commit on confirmation.

  refactor: split <original-slug> into <slug-a>, <slug-b>
  
  Wiki-Op: split

• Non-git wiki: append to wiki/log.md:

  ## [<today>] split | <original-slug> → <slug-a>, <slug-b>
  Inbound links repointed: <N> across <list of pages>

Common Mistakes

• Leaving dangling links — The whole point is a trustworthy graph. After any merge or split, grep for the removed slug; zero matches is the only acceptable result.
• Dropping citations during a fold — Every claim keeps its footnote. Renumber, don't delete. A merge that loses provenance is a regression.
• Blanket-replacing on a split — Each inbound link must be repointed by meaning, not by find-and-replace. That per-link judgment is the reason split is a deliberate skill.
• Merging without confirmation — Merge deletes a page and rewrites links across the wiki. Always show the plan and the diffs, and write only after the user confirms.
• Skipping the log — Record the operation so the slug change is traceable: a git wiki commits it (with the Wiki-Op: trailer); a non-git wiki appends to log.md.