plugin 0.3.0: port search-first rule + 6 new SKILL.md improvements

Promotes the previously session-local search-first write rule into the
canonical plugin and applies items 2-7 from echo-skill-improvements memory:

1. Loading Step 4 and a new mandatory pre-write search section now require
   POST /search/simple/?query=<slug> across all four project lifecycle
   subfolders before creating any slug-addressed note.
2. Daily-note Agent Log uses a resilient PATCH procedure that auto-creates
   the daily note from the template if missing and adds the heading if
   absent before patching.
3. New Style Rule: `created:` is the earliest known date, not "today";
   preserve it on merges.
4. New Project Lifecycle section: incubating / active / on-hold / archived,
   with the rule that folder and frontmatter.status must agree.
5. Session filename pinned to YYYY-MM-DD-HHMM-<slug>.md (lex-sortable);
   existing files left as-is.
6. Loading Step 3: read only the ~5 most recent sessions by reverse lex
   sort instead of the full list.
7. `source_notes` defined as a backward link to inputs; forward links
   belong in `## Related` in the body.

Repo layout: promotes the previously zipped-only plugin to a tracked
source tree at echo-memory.plugin.src/. The .plugin zip is rebuilt
from source on each version bump.

Bumps plugin.json to 0.3.0.

echo-memory.plugin.src/README.md

@@ -0,0 +1,55 @@
+# echo-memory
+
+Persistent memory for Claude via the **ECHO** Obsidian vault, using the [Obsidian Local REST API](https://github.com/coddingtonbear/obsidian-local-rest-api).
+
+Reads and writes notes across Claude/CoWork sessions using direct REST calls — no MCP server required. Built for **Jason Stedwell** (Director of Technical Services / Systems Engineer, MPM / ALABAMA wISP), who is both the operator and the architect of this vault. Successor to the obsidian-memory system and sibling of the goldbrain vault (Bryan's).
+
+## What it does
+
+- Loads operator preferences, current context, and relevant project notes at the start of substantive conversations
+- Writes facts, preferences, and decisions Jason asks Claude to remember
+- Logs working sessions so future conversations can pick up where they left off
+- Defers to the vault's own `BOOTSTRAP.md` to verify and repair structure
+
+## Configuration
+
+The plugin is hardcoded for:
+
+- **Server:** `https://echoapi.alwisp.com` (reverse proxy → backend Obsidian Local REST API)
+- **API Key:** stored in the skill (personal plugin, not for distribution)
+
+The endpoint presents a **valid TLS certificate**, so `-k` is not required. The bearer key lives only in the plugin — never inside the vault (per the vault's own safety rules).
+
+## Vault layout (root-addressed)
+
+```
+/vault/
+├── CLAUDE.md  STRUCTURE.md  BOOTSTRAP.md  spinup.md  index.md  README.md
+├── inbox/        (captures, imports, processing-log)
+├── journal/      (daily, weekly, monthly, templates)
+├── projects/     (active, incubating, on-hold, archived)
+├── areas/        (business, personal, learning, systems)
+├── resources/    (concepts, references, people, meetings, source-material)
+├── decisions/    (by-date, by-project)
+├── reviews/      (weekly, monthly, quarterly, annual)
+├── archive/      (notes, projects, imports)
+└── _agent/
+    ├── context/        ← task-scoped context bundles
+    ├── memory/         ← working / episodic / semantic
+    ├── sessions/       ← YYYY-MM-DD-HHMM-<slug>.md
+    ├── templates/      ← canonical note templates
+    ├── outputs/        ← briefs / drafts / summaries / synthesis
+    ├── skills/         ← active / archived
+    └── heartbeat/
+```
+
+## Skills
+
+| Skill | Triggers |
+|-------|----------|
+| `echo-memory` | "remember that", "save to memory", "what do you know about me", "load my profile", "check my notes", "log this decision", "add to my inbox" — and proactively at the start of substantive conversations |
+
+## Requirements
+
+- Obsidian running on the backend with the [Local REST API plugin](https://github.com/coddingtonbear/obsidian-local-rest-api) enabled
+- HTTPS access to `https://echoapi.alwisp.com` from the Claude/CoWork session environment