feat(manifest): add knowledge/graph computed artifacts to remaining unit types

M004 S01: Update manifests to support knowledge and graph artifacts.

Adds computed: ["knowledge", "graph"] to manifests that did not yet
declare them, matching the actual behavior of their prompt builders:

- execute-task, reactive-execute
- discuss-project, discuss-requirements, research-project
- workflow-preferences (knowledge only — no graph scope)

These unit types already inline knowledge/graph via their builder
functions in auto-prompts.js; the manifest declarations were missing.
This brings the manifest schema into sync with real dispatch behavior.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/resources/extensions/sf/unit-context-manifest.js

@@ -460,6 +460,7 @@ export const UNIT_MANIFESTS = {
 			inline: ["task-plan", "slice-plan", "prior-task-summaries", "templates"],
 			excerpt: [],
 			onDemand: ["slice-research"],
+			computed: ["knowledge", "graph"],
 		},
 		maxSystemPromptChars: COMMON_BUDGET_LARGE,
 	},
@@ -474,6 +475,7 @@ export const UNIT_MANIFESTS = {
 			inline: ["slice-plan", "prior-task-summaries", "templates"],
 			excerpt: [],
 			onDemand: ["slice-research"],
+			computed: ["knowledge", "graph"],
 		},
 		maxSystemPromptChars: COMMON_BUDGET_LARGE,
 	},
@@ -536,6 +538,7 @@ export const UNIT_MANIFESTS = {
 			inline: ["project", "templates"],
 			excerpt: [],
 			onDemand: [],
+			computed: ["knowledge", "graph"],
 		},
 		maxSystemPromptChars: COMMON_BUDGET_MEDIUM,
 	},
@@ -550,6 +553,7 @@ export const UNIT_MANIFESTS = {
 			inline: ["project", "requirements", "templates"],
 			excerpt: [],
 			onDemand: [],
+			computed: ["knowledge", "graph"],
 		},
 		maxSystemPromptChars: COMMON_BUDGET_MEDIUM,
 	},
@@ -564,6 +568,7 @@ export const UNIT_MANIFESTS = {
 			inline: ["project", "requirements", "decisions", "templates"],
 			excerpt: [],
 			onDemand: [],
+			computed: ["knowledge", "graph"],
 		},
 		maxSystemPromptChars: COMMON_BUDGET_LARGE,
 	},
@@ -578,6 +583,7 @@ export const UNIT_MANIFESTS = {
 			inline: ["templates"],
 			excerpt: [],
 			onDemand: [],
+			computed: ["knowledge"],
 		},
 		maxSystemPromptChars: COMMON_BUDGET_MEDIUM,
 	},