docs(assess): distinguish empty project from no project

Clarify that assess still runs inside an initialized Spec Kit project
(writing under .specify/assessments/) — only existing source code is
optional. Reword 'no repo at all'/'need no repo' to 'need no existing
codebase' so users don't expect intake to work outside a Spec Kit
project.

Assisted-by: GitHub Copilot (model: Claude Opus 4.8, autonomous)

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 9df2615e-6a99-4cdc-b4b2-fc72029bc1d9

Author: mnriem

extensions/assess/README.md

@@ -6,7 +6,7 @@ Discovery answers *"is this worth building?"* Delivery answers *"how do we build
 
 ## Overview
 
-`assess` works equally well for a **freshly initialized, empty project** or for an **existing codebase** — you do not need any source code to assess an idea. The input is just an idea: pasted text, a URL, or a ticket work with no repo at all, and a codebase pointer lets you assess an idea for existing code. Neither is more "correct" than the other.
+`assess` runs inside an initialized Spec Kit project (it writes assessments under `.specify/assessments/`), but that project can be **completely empty of source code** — a freshly initialized project with no code works just as well as an established codebase. The input is just an idea: pasted text, a URL, or a ticket need no existing code, while a codebase pointer lets you assess an idea for code that already exists. Neither starting point is more "correct" than the other.
 
 Each idea lives in its own directory under `.specify/assessments/<slug>/`, with one Markdown artifact per stage:
 

extensions/assess/commands/speckit.assess.intake.md

@@ -21,7 +21,7 @@ The user input is the idea and (optionally) a slug. Treat it as one of:
 3. **A codebase pointer** — phrasing like "an idea for this repo" or a path. Read enough of the repository to record what the idea relates to.
 4. **A mix** of the above.
 
-There is **no requirement for existing source code**: intake works just as well for an empty, freshly initialized project as for an existing codebase. Pasted text or a URL (options 1–2) need no repo; a codebase pointer (option 3) targets existing code. Both are equally valid.
+There is **no requirement for existing source code**: within an initialized Spec Kit project, intake works just as well when the project is empty of code as when it already has a codebase. Pasted text or a URL (options 1–2) need no existing codebase; a codebase pointer (option 3) targets existing code. Both are equally valid.
 
 If the input is empty, ask the user for the idea (interactive), or stop with a note that there is nothing to intake (automated).